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"Trench warfare" is a form of war in which both opposing armies have static lines of defense. Trench warfare arose when there was a revolution in firepower without similar advances in mobility and communications. Periods of trench warfare occurred during the American Civil War (1861–65), the Russo-Japanese War of 1904–05, and reached peak bloodshed on the Western Front (World War I) in the World War I.

Background Fortification is nearly as old as warfare itself; however, because of the relatively small size of the armies and the lack of range of the weapons, it was traditionally not possible to defend more than a short defensive line or an isolated strong point. The very long fortifications of the ancient world, such as the Great Wall of China or Hadrian's Wall, were exceptions to the general rule and were in any case not designed to completely prevent enemy crossing the border, but to act as a deterrent to casual border infringement, as well as to act as a border control. Although both the art of fortification and the art of weaponry advanced a great deal in the second half of the second millennium, the advent of the longbow, the muzzle-loading musket, and even of artillery did not substantially change the traditional rule that a fortification required a large body of troops to defend it. Small numbers of troops simply could not maintain a volume of fire sufficient to repel a determined attack.

Siege warfare Most of the techniques used in trench warfare had existed for years in siege warfare. It was the implementation of these techniques between two armies in the field that was new. Julius Caesar in his Gallic Wars describes how at the Battle of Alesia the Ancient Rome Roman legion created two huge fortified walls around the city. The inner circumvallation, 10 miles, held in Vercingetorix's forces, while the contravallation kept relief from reaching them. The Romans held the ground in between the two walls. The besieged Gauls, facing starvation, eventually surrendered with their relief force standing by helpless. Thucydides describes a similar, but unsuccessful, siege of Syracuse, Italy by the Athens during the Peloponnesian War.

Once siege engines were developed the techniques involved in assaulting a town or a fortress became well known and ritualised—the siège en forme. The attacking army would surround a town. Then the town would be asked to surrender. If they did not comply the besieging army would invest (surround) the town with temporary fortifications to stop sallies from the stronghold or relief getting in. The attackers would then build a length of trenches parallel to the defences and just out of range of the defending artillery. They would then dig a trench towards the town in a zigzag pattern so that it could not be Enfilade and defilade by defending fire, it also created a good vantage point from which to survey the enemy. Once within artillery range another parallel trench would be dug with gun emplacements. If necessary using the first artillery fire for cover, this process would be repeated until guns were close enough to be laid accurately to make a breach in the fortifications. In order that the "Forlorn Hope" and their support troops could get close enough to exploit the breach, more zigzag trenches could be dug even closer to the walls with more parallel trenches to protect and conceal the attacking troops. After each step in the process the besiegers would ask the besieged to surrender. If the first wave stormed the breach successfully, the defenders could expect no mercy. It was customary, from ancient history through the Middle Ages, for successful besiegers to massacre the inhabitants of any city that resisted a siege. Some conquerors, notably Tamerlane, liked to build huge mounds of skulls as monuments to their prowess.

Development The earliest known recorded use of trench warfare was employed by Muhammad as a general against the Banu Quraish army at the Battle of the Trench in 627. The idea was put forward by his companion, Salman the Persian (Salmaan Faarsi). This implies that the Sassanid Empire Persian Empire may have used trench warfare even earlier, during the Roman-Persian Wars against their arch rivals, the Byzantine Empire.

The first development that was essential for modern trench warfare however was the introduction of mass-conscripted armies during the French Revolution and the Napoleonic Wars. Prior to this, armies still consisted of small numbers of troops, which were unable to defend a large territory for very long—battles were either brief or degenerated into siege warfare. Large armies made it much more difficult for one army to outflank another, but it was still possible with cavalry and infantry charges for one army to break another by a direct assault. An example of early fortified military lines that stretched for many miles were the Lines of Torres Vedras (1810), which was built by the Portuguese under the direction of Royal Engineers of the British Army during the Peninsular war.

What made direct frontal assault increasingly suicidal was the development of improved firearm technology in the mid-19th century. When the American Civil War began in 1861, it was fought with Napoleonic War tactics. By 1863, it had many of the charicteristics of the World War I, including trenches, rifles, rapid-fire weapons (in WW1, machine guns), field fortifications, and massive casualties. The Battle of Petersburg, near the end of the war, with its trenches and static formations, contrasts sharply with the early battles, such as the First Battle of Bull Run, where manoeuvre was still possible; famous charges, such as Pickett's Charge's at the Battle of Gettysburg, revealed the futility of direct assault on an entrenched opposing line.

: Union Army Soldiers of 6th Corps, Army of the Potomac, in trenches before storming Marye's Heights at the 2nd Battle of Fredericksburg during the Chancellorsville campaign, Virginia, May 1863Several factors were responsible for the change. First, there was the proliferation of rifles (such as the .58 (14.7mm) Springfield Rifle), manufactured in the thousands. Effective at double the range of the typical smoothbore of the Napoleon (and able to kill a man at over 1000 m), they enabled men sheltering in a trench or behind an improvised obstacle to hold a body of attackers at a much greater distance than before; attackers were unable to cross the swept zone rapidly enough to avoid prohibitive casualties. Rifles had been used with considerable success in the American Revolution and War of 1812, but were slow to reload and often personal hunting weapons of frontiersmen. By the 1850s, the Minié ballActually a conoidal bullet allowed rifles, already widely adopted, to become very much more lethal. Second was the persistence of essentially Napoleonic columnar tactics, which magnified losses; only late in the war did Infantry tactics#Squad (or skirmish line) become standard. Thus, the first response to increased firepower (taking cover) and the second (dispersal of troops) were eventually adopted. The third (armour) was not then an option, as it had been in the face of longbow or Mongol bows; the fourth, speed (crossing the swept zone faster), was not either, for the fastest battlefield transport was the horse, and cavalry proved as vulnerable as infantry to the new weapons. This would persist into World War One.

Other factors appearing after the end of the American Civil War played a part. The first was the development of barbed wire (invented in 1874), which in itself did little harm to anyone but—crucially—could slow the progress of an attacking force and thus enable emplaced gunners to inflict crippling losses. A second was the improvement of artillery. Artillery in one form or another had been a part of warfare since classical times, and from the rise of gunpowder until the development of trench warfare in the 1860s had been the major killing force; it was supplanted only temporarily by the rifle. With the development of steel Breech-loading weapon by Krupp, however, much of its former power was restored (as graphically demonstrated in the Franco-Prussian War of 1870–71). Third was the introduction of Shell (projectile)#High Explosive .28HE.29, which amplified killing power up to sixteenfold. Fourth, hydraulic recoil mechanisms, pioneered by the French Canon de 75 modèle 1897 (the famed "French 75") significantly increased the rate of fire and accuracy. These magnified the effectiveness of artillery to a degree unimaginable in the 1870s. The swept zone between attacker and defender became a "no man's land", too lethal to cross. Finally, and most often ignored, was the introduction of telephone communication, which freed batteries from artillery spotting, widening artillery usefulness in indirect fire and speeding shifting of targets.

Implementation sentry in a trench near La Boisselle during the Battle of the Somme (1916), July 1916Although firearms technology and the conscript army dramatically changed the nature of warfare, most armies were completely unaware of the implications of these changes and were not prepared for their consequences. As early as 1864, the opposing armies in the American Civil War were entrenched near Petersburg, Virginia for months, and tactics which were later to be tried in Europe, such as subterranean mines, were employed to break the stalemate -- to little effect.

At the start of World War I, most armies prepared for a brief war whose strategy and tactics would have been familiar to Napoleon. Indeed, a number of cavalry units were brought to the front by train, commanded by officers who did not imagine the factors that would render them useless. Most of these units were never deployed. However, as war broke out, Germany and Allied (mostly France and United Kingdom) forces soon learned that with modern weapons even a shallow scrape in the soil could be defended by a handful of infantry. To attack frontally was to court crippling losses, so an outflanking operation was essential. After the First Battle of the Aisne in September 1914, an extended series of attempted flanking moves, and matching extensions to the fortified defensive lines, soon saw the celebrated "race to the sea"; German and Allied armies produced essentially a matched pair of trench lines from the Swiss border in the south to the North Sea coast of Belgium. Trench warfare prevailed on the Western Front (World War I) from September 16, 1914, until the Germans launched their "Spring Offensive", Operation Michael, on March 21, 1918.

On the Western Front, the small improvised trenches of the first few months rapidly grew deeper and more complex, gradually becoming vast areas of interlocking defensive works. The space between the opposing trenches was referred to as "no man's land" (for its lethal uncrossability) and varied in width depending on the battlefield. On the Western Front it was typically between 100 and 300 yards (90-275 m), though only 30 yards (27 m) on Battle of Vimy Ridge. After the German withdrawal to the Hindenburg line in March 1917, it stretched to over a kilometre in places. At the infamous "Quinn's Post" in the cramped confines of the Anzac battlefield at Battle of Gallipoli, the opposing trenches were only 15 m (16yd) apart and a grenade war was waged there incessantly. On the Eastern Front (World War I) and in the Middle East, the areas to be covered were so vast, and the distances from the factories that supplied shells, bullets, concrete and barbed wire so great, that trench warfare in the European style often did not eventuate.

In the Alps the trench warfare even stretched into the 3rd dimension, on vertical slopes and deep into the mountains, up to heights of 3900 m (12795 ft) above sea level (the Ortler had an artillery position on its summit near the front line). The trench-line management and trench profiles had to be adapted to the rough terrain, the hard rock, and the harsh weather conditions. Many trench systems were constructed within glaciers like the Adamello-Presanella group or the famous city below the ice on the Marmolada in the Dolomites.

Defensive system , in communication trench near Beaumont Hamel, Somme, 1916

Very early in the war the British defensive doctrine suggested a main trench system of three parallel lines, interconnected by communications trenches. The point at which a communications trench intersected the front trench was of critical importance, and it was usually heavily fortified. The front trench was lightly garrisoned and typically only occupied in force during "stand to" at dawn and dusk. Between 70 and 100 yards (64-91 m) behind the front trench was located the support (or "travel") trench, to which the garrison would retreat when the front trench was bombarded. Between 300 and 500 yards (275-460 m) further to the rear was located the third reserve trench, where the reserve troops could amass for a counter-attack if the front trenches were captured. This defensive layout was soon rendered obsolete as the power of the artillery grew; however, in certain sectors of the front, the support trench was maintained as a decoy to attract the enemy bombardment away from the front and reserve lines. Fires were lit in the support line to make it appear inhabited, and any damage due immediately repaired.



Temporary trenches were also built. When a major attack was planned, assembly trenches would be dug near the front trench. These were used to provide a sheltered place for the waves of attacking troops who would follow the first waves leaving from the front trench. "Saps" were temporary, unmanned, often dead-end utility trenches dug out into no-man's land. They fulfilled a variety of purposes, such as connecting the front trench to a listening post close to the enemy wire or providing an advance "jumping-off" line for a surprise attack. When one side's front line bulged towards the opposition, a "salient (military)" was formed. The concave trench line facing the salient was called a "re-entrant." Large salients were perilous for their occupants because they could be assailed from three sides.

Behind the front system of trenches there were usually at least two more partially prepared trench systems, kilometres to the rear, ready to be occupied in the event of a retreat. The Germans often prepared multiple redundant trench systems; in 1916 their Somme front featured two complete trench systems, one kilometre apart, with a third partially completed system a further kilometre behind. This duplication made a decisive breakthrough virtually impossible. In the event that a section of the first trench system was captured, a "switch" trench would be dug to connect the second trench system to the still-held section of the first. The Germans made something of a science out of designing and constructing defensive works. They used reinforced concrete to construct deep, shell-proof, ventilated dugouts, as well as strategic strongpoints. They were more willing than their opponents to make a strategic withdrawal to a superior prepared defensive position. They were also the first to apply the concept of "defence in depth," where the front-line zone was hundreds of yards deep and contained a series of redoubts rather than a continuous trench. Each redoubt could provide supporting fire to its neighbours, and while the attackers had freedom of movement between the redoubts, they would be subjected to withering enfilade fire. The British eventually adopted a similar approach, but it was incompletely implemented when the Germans launched the 1918 "Spring Offensive" and proved disastrously ineffective. France, by contrast, relied on artillery and reserves, not entrenchment. The characteristic barbed wire placed before trenches, in belts 15 m (50 ft) deep or more, differed, too; the German wire was heavier gauge, and British wire cutters (designed for the thinner native product) were unable to cut it.Canada's Army, p.79.

Trench construction

Trenches were never straight but were dug in a zigzaging pattern that broke the line into bays connected by traverses. This meant that a soldier could never see more than 10 metres (30 ft) or so along the trench. The trenches were dug like this so an enemy would not be able to attack from the sides thus causing major damage. Consequently, the entire trench could not be enfiladed if the enemy gained access at one point; or if a bomb or shell landed in the trench, the fragmentation (weaponry) (often called shrapnel) could not travel far. Another bonus for building trenches in a zig zag pattern was that if enemy aircraft were sent to gather intelligence for artillery strikes, it would be harder for them to accurately give co-ordinates for zig zagging trenches than straight trenches. The side of the trench facing the enemy was called the parapet and had a fire step. The rear of the trench was called the parados. The parados protected the soldier's back from fragmentation from shells falling behind the trench. If the enemy captured the trench, then the parados would become their "parapet". The sides of the trench were revetted with sandbags, wooden frames and wire mesh. The floor of the trench was usually covered by wooden duckboards.

Dugouts of varying degrees of luxury would be built in the rear of the support trench. British dugouts were usually 8 to 16 feet (2.5-5 m) deep, whereas German dugouts were typically much deeper, usually a minimum of 12 feet (3.6 m) deep and sometimes dug three stories down, with concrete staircases to reach the upper levels. "Luxury" was a relative term when prolonged rain reduced the floor and walls to mud.

man using a periscope rifle, Gallipoli 1915

To allow a soldier to see out of the trench without exposing his head, a loophole would be built into the parapet. A loophole might simply be a gap in the sandbags, or it might be fitted with a steel plate. German snipers used armour-piercing bullets that allowed them to penetrate loopholes. The other means to see over the parapet was the trench periscope—in its simplest form, just a stick with two angled pieces of mirror at the top and bottom. In the Anzac trenches at Gallipoli, where the Turkey held the high ground, the periscope rifle was developed to enable the Australians and New Zealanders to snipe at the enemy without exposing themselves over the parapet.

There were three standard ways to dig a trench: entrenching, sapping, and tunnelling. Entrenching, where a man would stand on the surface and dig downwards, was most efficient, as it allowed a large digging party to dig the full length of the trench simultaneously. However, entrenching left the diggers exposed above ground and hence could only be carried out when free of observation, such as in a rear area or at night. Sapping involved extending the trench by digging away at the end face. The diggers were not exposed, but only one or two men could work on the trench at a time. Tunnelling was like sapping except that a "roof" of soil was left in place while the trench line was established and then removed when the trench was ready to be occupied. The guidelines for British trench construction stated that it would take 450 men 6 hours (at night) to complete 250 m (275yd) of front-line trench system. Thereafter, the trench would require constant maintenance to prevent deterioration caused by weather or shelling.



The battlefield of Flanders, which saw some of the worst fighting, presented numerous problems for the practice of trench warfare, especially for the British, who were often compelled to occupy the low ground. Heavy shelling quickly destroyed the network of ditches and water channels which had previously drained this low-lying area of Belgium. In most places, the water table was only a metre or so below the surface, meaning that any trench dug in the ground would quickly flood. Consequently, many "trenches" in Flanders were actually above ground and constructed from massive breastworks of sandbags (actually filled with clay). Initially, both the parapet and parados of the trench were built in this way, but a later technique was to dispense with the parados for much of the trench line, thus exposing the rear of the trench to fire from the reserve line in case the front was breached.

Trench geography The confined, static, and subterranean nature of trench warfare resulted in it developing its own peculiar form of geography. In the forward zone, the conventional transport infrastructure of roads and rail were replaced by the network of trenches and light tramways. The critical advantage that could be gained by holding the high ground meant that minor hills and ridges gained enormous significance. Many slight hills and valleys were so subtle as to have been nameless until the front line encroached upon them. Some hills were named for their height in metres, such as Battle of Hill 60 (Western Front). A farmhouse, windmill, quarry, or copse of trees would become the focus of a determined struggle simply because it was the largest identifiable feature. However, it would not take the artillery long to obliterate it, so that thereafter it became just a name on a map.

s training with a flamethrower near Sedan, France, May 1917

Battlefield features could be given a descriptive name ("Polygon Wood" near Ypres or "Battle of Lone Pine"), a whimsical name ("Sausage Valley" and "Mash Valley" on the Somme), a unit name ("Inniskilling Inch" at Helles named for the Royal Inniskilling Fusiliers) or the name of a soldier ("Monash Valley" at Anzac Cove named after General John Monash). Prefixing a feature with "Dead Man's" was also popular for obvious reasons, such as "Dead Man's Road" leading in to Pozières, or "Dead Man's Ridge" at Anzac Cove. There were numerous trench networks named "The Chessboard" or "The Gridiron" because of the pattern they described. For the Australians at Battle of Mouquet Farm, the advances were so short and the terrain so featureless that they were reduced to naming their objectives as "points" on the map, such as "Point 81" and "Point 55."Enemy trenches, which would become objectives in an attack, needed to be named as well. Many were named for some observed event such as "German Officers' Trench" at Anzac Cove (where a couple of German officers were sighted) or "Ration Trench" on the Somme (where German ration-carrying parties were sighted). The British gave an alcoholic flavour to the German trenches in front of Ginchy: "Beer Trench," "Bitter Trench," "Hop Trench," "Ale Alley," and "Pilsen Trench." Other objectives were named according to their role in the trench system, such as the "Switch Trench" and "Intermediate Trench" on the Somme. Some sections of the British trench system read like a Monopoly (game) board, with names such as "Park Lane" and "Bond Street," British regular divisions habitually named their trenches after units, which resulted in names such as "Munster Alley" (Royal Munster Fusiliers), "Black Watch Alley" (Black Watch) and "Border Barricade" (Border Regiment). The Australian and New Zealand Army Corpss tended to name features after soldiers ("Plugge's Plateau," "Walker's Ridge," "Quinn's Post," "Johnston's Jolly," "Russell's Top," "Brind's Road" and so forth).

Life in the trenches An individual soldier's time in the front-line trench was usually brief; from as little as one day to as much as two weeks at a time before being relieved. The Australian 31st Battalion once spent 53 days in the line at Villers Bretonneux, but such a duration was a rare exception. A typical British soldier's year could be divided as follows:

• 15% front line
• 10% support line
• 30% reserve line
• 20% rest
• 25% other (hospital, traveling, leave, training courses, etc.)

Even when in the front line, the typical soldier would only be called upon to engage in fighting a handful of times a year—making an attack, defending against an attack or participating in a raid. The frequency of combat would increase for the men of the "elite" fighting divisions—on the Allied side; the British regular divisions, the Canadian Corps, the French XX Corps and the Australian and New Zealand Army Corpss.

Some sectors of the front saw little activity throughout the war, making life in the trenches comparatively easy. When the I Anzac Corps first arrived in France in April 1916 after the evacuation of Gallipoli, they were sent to a relatively peaceful sector south of Armentières to "acclimatise". Other sectors were in a perpetual state of violent activity. On the Western Front, Ypres was invariably hellish, especially for the British in the exposed, overlooked salient. However, quiet sectors still amassed daily casualties through sniper fire, artillery, disease, and poison gas. In the first six months of 1916, before the launch of the Somme Offensive, the British did not engage in any significant battles on their sector of the Western Front and yet suffered 107,776 casualties.

A sector of the front would be allocated to an army corps, usually comprising three division (military)s. Of these two divisions would occupy adjacent sections of the front and the third would be in rest to the rear. This breakdown of duty would continue down through the army structure, so that within each front-line division, typically comprising three infantry brigades (regiments for the Germans), two brigades would occupy the front and the third would be in reserve. Within each front-line brigade, typically comprising four battalions, two battalions would occupy the front with two in reserve. And so on for companies and platoons. The lower down the structure this division of duty proceeded, the more frequently the units would rotate from front-line duty to support or reserve.



During the day, snipers and artillery observers in balloons made movement perilous, so the trenches were mostly quiet. Consequently, the trenches were busiest at night, when cover of darkness allowed the movement of troops and supplies, the maintenance and expansion of the barbed wire and trench system, and reconnaissance of the enemy's defenses. Sentries in listening posts out in no man's land would try to detect enemy patrols and working parties or indications that an attack was being prepared.

Pioneered by the Princess Patricia's Canadian Light Infantry in February 1915,Canada's Army, p.82. trench raids were carried out in order to capture prisoners and "booty"—letters and other documents to provide intelligence about the unit occupying the opposing trenches. As the war progressed, raiding became part of the general British policy, the intention being to maintain the fighting spirit of the troops and to deny no man's land to the Germans. As well, they were intended to force the enemy to reinforce, which exposed his troops to artillery fire.ibid. Such dominance was achieved at a high cost, when the enemy replied with his own artillery,ibid. and a post-war British analysis concluded the benefits were probably not worth the cost. Early in the war, surprise raids would be mounted, particularly by the Canadas, but increased vigilance made achieving surprise difficult as the war progressed. By 1916, raids were carefully planned exercises in combined arms and involved close co-operation of infantry and artillery. A raid would begin with an intense artillery bombardment designed to drive off or kill the front-trench garrison and cut the barbed wire. Then the bombardment would shift to form a "box", or cordon, around a section of the front line to prevent a counter-attack intercepting the raid. However, the bombardment also had the effect of notifying the enemy of the location of the planned attack, thus allowing reinforcements to be called in from wider sectors.

Death in the trenches soldiers capture a Germany trench with guns and grenades. Circa 1945.The intensity of World War I trench warfare meant about 10% of the fighting soldiers were killed. This compared to 5% killed during the Second Boer War and 4.5% killed during World War II. For British and Dominion troops serving on the Western Front, the proportion of troops killed was 12%, while the total proportion of troops who became casualties (killed or wounded) was 56%. Considering that for every front-line infantryman there were about three soldiers in support (artillery, supply, medical, and so on), it was highly unlikely for a fighting soldier to survive the war without sustaining some form of injury. Indeed many soldiers were injured more than once during the course of their service.

Medical services were primitive and life-saving antibiotics had not yet been discovered. Relatively minor injuries could prove fatal through onset of infection and gangrene. The Germans recorded that 12% of leg wounds and 23% of arm wounds resulted in death, mainly through infection. The United States recorded 44% of casualties who developed gangrene died. Half of those who were wounded in the head died and only 1% of those wounded in the abdomen survived. Three-quarters of wounds inflicted during the war came from shell fire. The wound resulting from a shell fragment was usually more traumatic than a gunshot wound. A shell fragment would often introduce debris making it more likely that the wound would become infected. These factors meant a soldier was three times more likely to die from a shell wound to the chest than from a gunshot wound. The blast from shell explosions could also kill by concussion. In addition to the physical effects of shell fire, there was the psychological damage. Men who had to endure a prolonged bombardment would often suffer debilitating shell shock, a condition not well understood at the time. (It is now usually called Post Traumatic Stress Disorder and is better, but still not well, understood.)

As in many other wars, World War I's greatest killer was disease. sanitation conditions in the trenches were quite poor, and common infections included dysentery, typhus, and cholera. Many soldiers suffered from parasites and related infections. Poor hygiene also led to fungal conditions, such as trench mouth and trench foot. Another common killer was exposure, since the temperature within a trench in the winter could easily fall below zero degrees Celsius (32 °F). Burial of the dead was usually a luxury that neither side could easily afford. The bodies would lie in no man's land until the front line moved, by which time the bodies were often unidentifiable. On some battlefields, such as at Battle of the Nek in Gallipoli, the bodies were not buried until after the war. On the Western Front, bodies continue to be found as fields are ploughed and building foundations dug.



At various times during the war—particularly early on—official truces were organised so that the wounded could be recovered from no man's land and the dead could be buried. Generally, senior commands disapproved of any slackening of the offensive for humanitarian reasons and so ordered their troops not to permit enemy stretcher-bearers to operate in no man's land. However, this order was almost invariably ignored by the soldiers in the trenches, who knew that it was to the mutual benefit of the fighting men of both sides to allow the wounded to be retrieved. So, as soon as hostilities ceased, parties of stretcher bearers, marked with Red Cross (symbol) flags, would go out to recover the wounded, sometimes swapping enemy wounded for their own. There were occasions when this unofficial cease fire was exploited to conduct a reconnaissance or to reinforce or relieve a garrison. One famous truce was the Christmas truce between British and German soldiers in the winter of 1914 on the front near Armentieres. German soldiers began singing Christmas carols and soon soldiers left their trenches. The soldiers exchanged gifts and stories, and played several games of football. As mentioned previously, the commanders of the warring nations disapproved of this cease fire, and the British court-martialed several of their soldiers. The spirit of this truce is portrayed in the 2005 movie Merry Christmas (film) (Joyeux Noël).

Weapons of trench warfare Infantry weapons The common infantry soldier had four weapons to use in the trenches: the rifle, bayonet, shotgun, and hand grenade. The standard issue British rifle was the .303 Short Magazine Lee-Enfield (SMLE), originally developed as a cavalry carbine, with a maximum range of 1400yd (1280 m). The Ross rifle was widely used by the Canadian Corps early in the war and was reputedly more accurate than the British SMLE. However, it proved notoriously unreliable under battlefield conditions, often jamming when dirty or fired rapidly, and was gradually discarded for routine use in favour of the SMLE, except for sniping. Early in the war, the British were able to defeat German attacks at Battle of Mons and the First Battle of Ypres with massed rifle fire, but as trench warfare developed, opportunities to assemble a line of riflemen disappeared.

The German counterpart to the Lee-Enfield was the 7.92x57mm (.323") Mauser Gewehr 98. It was less suited to rapid fire than the SMLE, due to its smaller magazine and slower rate of fire. The British soldier was equipped with a 21-inch (53 cm) sword bayonet, which was too long and unwieldy to be particularly effective in close-quarters combat. However, bayonet use was safer than firing the rifle which, in a mêlée, might strike an ally instead of an enemy. British figures recorded only 0.3% of wounds were caused by bayonets; however, a strike from a bayonet was likely to result in death. The bayonet was also used to finish off wounded enemy soldiers during an advance, both saving ammunition and reducing the probability of being attacked from the rear. Imperial German soldiers generally carried the S98/05 "Butcher-blade" bayonet, which was an effective weapon in the open, but like the British bayonet, difficult to use in the narrow trenches when attached to a rifle.

Many soldiers preferred a short-handled spade or entrenching tool over a bayonet. They would sharpen the blade so it was just as effective as a bayonet, and the shorter length made them handier to use in the confined quarters of the trenches. These tools could then be used to dig in after they had taken a trench. Since the troops were often not adequately equipped for trench warfare, improvised weapons were common in the first encounters, such as short wooden clubs and metal Mace (club)s, as well as trench knives and brass knuckles (see trench raiding). As the war progressed, better equipment was issued, and improvised arms were discarded.

Used by American soldiers in the Western front, the pump action shotgun was a formidable weapon in short range combat, enough so that Germany lodged a formal protest against their use on 14 September 1918, stating "every prisoner found to have in his possession such guns or ammunition belonging thereto forfeits his life" (though this threat was apparently never carried out). The U.S. military began to issue models specially modified for combat, called "trench guns", with shorter barrels, higher capacity magazines, no Shotgun#Pattern and choke, and often heat shields around the barrel, as well as lugs for the M1917 bayonets. Australian and New Zealand Army Corps and some British soldiers were also known to use sawn-off shotguns in trench raids, because of their portability, effectiveness at close range, and ease of use in the confines of a trench. This practice was not officially sanctioned, and the shotguns used were invariably modified sporting guns.

The hand grenade came to be the primary infantry weapon of trench warfare. Both sides were quick to raise specialist bombing squads. The grenade enabled a soldier to engage the enemy without exposing himself to fire, and it did not require precise accuracy to kill or maim. The Germans and Turks were well equipped with grenades from the start of the war, but the British, who had ceased using grenadiers in the 1870s and did not anticipate a siege war, entered the conflict with virtually none, so soldiers had to improvise bombs with whatever was available. By late 1915, the British Mills bomb had entered wide circulation, and by the end of the war 75 million had been used.

Machine guns The machine gun is perhaps the signature weapon of trench warfare, with the image of ranks of advancing infantry being scythed down by the withering hail of bullets. The Germans embraced the machine gun from the outset—in 1904, sixteen units were equipped with Maschinengewehr—and the machine gun crews were the elite infantry units; these units were attached to Jaeger (light infantry) battalions. By 1914, British infantry units were armed with two Vickers machine guns per battalion, the Germans had six per battalion, the Russians eight. As for the Americans, they had to wait until 1917 to see every infantry unit carry at least one machine gun. After 1915, the Maschinengewehr 08 was the standard issue German machine gun; its number entered the German language as idiomatic for "dead plain". At Gallipoli and in Palestine the Turks provided the infantry, but it was usually Germans who manned the machine guns.

The British High Command were less enthusiastic about machine guns, supposedly considering the weapon too "unsporting" and encouraging defensive fighting; and they lagged behind the Germans in adopting it. Field Marshall Sir Douglas Haig is quoted as saying in 1915, "The machine gun is a much overrated weapon; two per battalion is more than sufficient", which resulted in record numbers of British casualties. In 1915 the Machine Gun Corps was formed to train and provide sufficient heavy machine gun teams. It was the Canadians that made the best practice, pioneering area denial and indirect fire (soon adopted by all Allied armies) under the guidance of former French Army Reserve officer Major General Raymond Brutinel. Minutes before the attack on Vimy Ridge the Canadians also thickened the artillery barrage by aiming machine guns at the precise angle to rain down on the Germans, they also significantly increased the amount of machine guns per battalion. To match demand, production of the Vickers machine gun was contracted to firms in the United States. By 1917, every company in the British forces were also equipped with four Lewis guns, which significantly enhanced their firepower.



The heavy machine gun was a specialist weapon, and in a static trench system was employed in a scientific manner, with carefully calculated fields of fire, so that at a moment's notice an accurate burst could be fired at the enemy's parapet or a break in the wire. Equally it could be used as light artillery in bombarding distant trenches. Heavy machine guns required teams of up to eight men to move them, maintain them, and keep them supplied with ammunition. This made them impractical for offensive maneuvers, contributing to the stalemate on the Western Front.

Mortars Mortar (weapon)s, which lobbed a shell in a high arc over a relatively short distance, were widely used in trench fighting for harassing the forward trenches, for cutting wire in preparation for a raid or attack, and for destroying dugouts, saps and other entrenchments. In 1914, the British fired a total of 545 mortar shells; in 1916, they fired over 6,500,000.

The main British mortar was the Stokes mortar, precursor of the modern mortar. It was a light mortar, but was easy to use, and capable of a rapid rate of fire by virtue of the propellant cartridge being attached to the shell. To fire the Stokes mortar, the round was simply dropped into the tube, where the cartridge was ignited automatically when it struck the firing pin at the bottom. The Germans used a range of mortars. The smallest were grenade-throwers (Granatenwerfer) which fired "pineapple" bombs. Their medium trench-mortars were called mine-throwers (Minenwerfer), dubbed "moaning minnies" by British Commonwealth troops. The heavy mortar was called the Ladungswerfer, which threw "aerial torpedoes", containing a 200 lb (90 kg) charge to a range of 1000yd (914 m). The flight of the missile was so slow and leisurely men on the receiving end could make some attempt to seek shelter.

Artillery Artillery dominated the battlefield of trench warfare in the same way air power dominates the modern battlefield. An infantry attack was rarely successful if it advanced beyond the range of its supporting artillery. In addition to bombarding the enemy infantry in the trenches, the artillery could be used to cover infantry advances with creeping barrage or box barrages, or engage in counter-battery duels to try to destroy the enemy's guns. Artillery mainly fired fragmentation (weaponry), high explosive, or, later in the war, gas shells. The British experimented with firing thermite incendiary shells to set trees and ruins alight.



Artillery pieces were of two types: guns and howitzers. Guns fired high-velocity shells over a flat trajectory and were often used to deliver fragmentation and to cut barbed wire. Howitzers lofted the shell over a high trajectory so it plunged into the ground. The largest calibers were usually howitzers. The German 420 mm howitzer weighed 20 tons and could fire a one-ton shell over 10 km. A critical feature of period artillery pieces was the hydraulic recoil mechanism, which meant the gun did not need to be re-laid (re-aimed) after each shot. Initially each gun would need to register its aim on a known target, in view of an observer, in order to fire with precision during a battle. The process of gun registration would often alert the enemy an attack was being planned. Towards the end of 1917, artillery techniques were developed enabling fire to be delivered accurately without registration on the battlefield - the gun registration was done behind the lines then the pre-registered guns were brought up to the front for a surprise attack.

Gas Tear gas was first employed in August 1914 by the French, but this could only disable the enemy. In April 1915, chlorine was first used by Germany at the Second Battle of Ypres. A large enough dose could kill, but the gas was easy to detect by scent and sight. Those that were not killed on exposure could suffer permanent lung damage. Phosgene, first used in December 1915, was the ultimate killing gas of World War I—it was 18 times more powerful than chlorine and much more difficult to detect. However, the most effective gas was mustard gas, introduced by Germany in July 1917. Mustard gas was not as fatal as phosgene, but it was hard to detect and lingered on the surface of the battlefield and so could inflict casualties over a long period. The burns it produced were so horrific that a casualty resulting from mustard gas exposure was unlikely to be fit to fight again. Only 2% of mustard gas casualties died, mainly from secondary infections.

The first method of employing gas was by releasing it from a cylinder when the wind was favourable. Such an approach was obviously prone to miscarry if the direction of the wind was misjudged. Also, the cylinders needed to be positioned in the front trenches where they were likely to be ruptured during a bombardment. Later in the war, gas was delivered by artillery or mortar shell.

in trench, Hirtzbach Woods, Haut-Rhin, France, 1917

Helmets During the first year of the First World War, none of the combatant nations equipped their troops with steel helmets. Soldiers went into battle wearing simple cloth or leather caps that offered virtually no protection from the damage caused by modern weapons. German troops were wearing the traditional leather Pickelhaube (spiked helmet), with a covering of cloth to protect the leather from the splattering of mud. Once the war entered the static phase of trench warfare, the number of lethal head wounds that troops were receiving from fragmentation (weaponry) increased dramatically. The French were the first to see a need for greater protection and began to introduce steel helmets in the summer of 1915. The Adrian helmet (designed by August-Louis Adrian) replaced the traditional French kepi and was later adopted by the Belgian, Italian and many other armies.

At about the same time the British were developing their own helmets. The French design was rejected as not strong enough and too difficult to mass-produce. The design that was eventually approved by the British was the Brodie helmet (designed by John L. Brodie). This had a wide brim to protect the wearer from falling objects, but offered less protection to the wearer's neck. When the Americans entered the war, this was the helmet they chose, though some units used the French Adrian helmet. The traditional German pickelhaube was replaced by the Stahlhelm or "steel helmet" in 1916. Some elite Italian units used a helmet derived from ancient Roman designs. None of these standard helmets could protect the face or eyes, however. Special face-covers were designed to be used by machine-gunners, and the Belgians tried out goggles made of louvres to protect the eyes.

Wire The use of barbed wire was decisive in slowing infantry traveling across the battlefield. Without it, fast moving infantry (or cavalry) might cross the lines and reach the enemy machine gun posts and artillery. Slowed down by the barbed wire, they were much more likely to be shot down by machine guns or rifles. Liddell Hart identified barbed wire and the machine gun as the elements that had to be broken to regain a mobile battlefield. Wiring was usually done at night, to avoid casualties in no man's land. The screw picket, invented by the Germans (and later adopted by the Allies) during the war, was quieter than driving stakes, and thus helped decrease the amount of noise working parties would create. Methods to defeat it were rudimentary. British and Commonwealth forces relied on wire cutters, which proved unable to cope with the heavier gauge German wire.Canada's Army, p.79. The Bangalore torpedo was adopted by many armies, and continued in use past the end of World War II."Bangalore torpedo", in Fitzsimons, Bernard, editor, Encyclopedia of 20h Century Weapons and Warfare (London: Phoebus Publishing Company 1977), Volume 3, p.269.

Aircraft The fundamental purpose of the aircraft in trench warfare was reconnaissance and artillery observation. Aerial reconnaissance was so significant in exposing movements, it has been said the trench stalemate was a product of it."Aces: A Story of the First World War", written by George Pearson, historical advisors Brereton Greenhous & Philip Markham, National Film Board of Canada, 1993. The role of the fighter aircraft was to protect friendly reconnaissance aircraft and destroy those of the enemy, or at least deny them the freedom of friendly airspace. This involved achieving air superiority over the battlefield by destroying the enemy's fighters as well. Spotter aircraft would monitor the fall of shells during registration of the artillery. Reconnaissance aircraft would map trench lines (first with hand-drawn diagrams, later photographs), monitor enemy troop movements, and locate enemy artillery batteries so that they could be destroyed with counter-battery fire. Some ingenious pilots would carry bricks with them when going on flights in order to drop on the enemy, before dropping bombs became more commonplace.

Other weapons The Germans employed flame throwers (Flammenwerfer) during the war but as the technology was in its infancy, its value was mostly psychological.

Later in the war, the Allies sometimes used tanks to get the advantage in battle. Tanks were helpful in destroying the enemy's trenches. They could penetrate barbed wire, some could bridge trenches, and machine guns did not damage them, thus overcoming the major obstacles of trench warfare. Unfortunately, tanks of the time period were very slow, very heavy, and often mechanically unreliable. As well, they were still vulnerable to artillery fire.

Mining All sides would engage in vigorous mining and counter-mining duels. The dry chalk of the Somme was especially suited to mining, but with the aid of pumps, it was also possible to mine in the sodden clay of Flanders. Specialist tunneling companies, usually made up of men who had been miners in civilian life, would dig tunnels under no man's land and beneath the enemy's trenches. These mines would then be packed with explosives and detonated, producing a large crater. The crater served two purposes: it could destroy or breach the enemy's trench and, by virtue of the raised lip that they produced, could provide a ready-made "trench" closer to the enemy's line. When a mine was detonated, both sides would race to occupy and fortify the crater.

If the miners detected an enemy tunnel in progress, they would often drive a counter-tunnel, called a camouflet, which would be detonated in an attempt to destroy the other tunnel prematurely. Night raids were also conducted with the sole purpose of destroying the enemy's mine workings. On occasion, mines would cross and fighting would occur underground. The mining skills could also be used to move troops unseen. On one occasion a whole British division was moved through interconnected workings and sewers without German observation. The British detonated a number of mines on July 1, 1916, the first day of the Battle of the Somme (1916). The largest mines—the Y Sap Mine and the Lochnagar Mine—each containing 24 tons of explosives, were blown near La Boiselle, throwing earth 4,000 feet into the air.

At 3.10 AM on June 7, 1917, 19 mines were detonated by the British to launch the Passchendaele#Messines Ridge. The average mine contained 21 tons of explosive and the largest, 125 feet beneath Saint-Eloi, was twice the average at 42 tons. The combined force of the explosions was supposedly felt in England. As the Chief of Staff of the British Second Army, General Sir Charles Harrington, commented on the eve of the battle:

I do not know whether we shall change history tomorrow, but we shall certainly alter the geography.

The craters from these and many other mines on the Western Front are still visible today. Three further mines were laid for Messines but were not detonated as the t "Trench warfare" is a form of war in which both opposing armies have static lines of defense. Trench warfare arose when there was a revolution in firepower without similar advances in mobility and communications. Periods of trench warfare occurred during the American Civil War (1861–65), the Russo-Japanese War of 1904–05, and reached peak bloodshed on the Western Front (World War I) in the World War I.

Background Fortification is nearly as old as warfare itself; however, because of the relatively small size of the armies and the lack of range of the weapons, it was traditionally not possible to defend more than a short defensive line or an isolated strong point. The very long fortifications of the ancient world, such as the Great Wall of China or Hadrian's Wall, were exceptions to the general rule and were in any case not designed to completely prevent enemy crossing the border, but to act as a deterrent to casual border infringement, as well as to act as a border control. Although both the art of fortification and the art of weaponry advanced a great deal in the second half of the second millennium, the advent of the longbow, the muzzle-loading musket, and even of artillery did not substantially change the traditional rule that a fortification required a large body of troops to defend it. Small numbers of troops simply could not maintain a volume of fire sufficient to repel a determined attack.

Siege warfare Most of the techniques used in trench warfare had existed for years in siege warfare. It was the implementation of these techniques between two armies in the field that was new. Julius Caesar in his Gallic Wars describes how at the Battle of Alesia the Ancient Rome Roman legion created two huge fortified walls around the city. The inner circumvallation, 10 miles, held in Vercingetorix's forces, while the contravallation kept relief from reaching them. The Romans held the ground in between the two walls. The besieged Gauls, facing starvation, eventually surrendered with their relief force standing by helpless. Thucydides describes a similar, but unsuccessful, siege of Syracuse, Italy by the Athens during the Peloponnesian War.

Once siege engines were developed the techniques involved in assaulting a town or a fortress became well known and ritualised—the siège en forme. The attacking army would surround a town. Then the town would be asked to surrender. If they did not comply the besieging army would invest (surround) the town with temporary fortifications to stop sallies from the stronghold or relief getting in. The attackers would then build a length of trenches parallel to the defences and just out of range of the defending artillery. They would then dig a trench towards the town in a zigzag pattern so that it could not be Enfilade and defilade by defending fire, it also created a good vantage point from which to survey the enemy. Once within artillery range another parallel trench would be dug with gun emplacements. If necessary using the first artillery fire for cover, this process would be repeated until guns were close enough to be laid accurately to make a breach in the fortifications. In order that the "Forlorn Hope" and their support troops could get close enough to exploit the breach, more zigzag trenches could be dug even closer to the walls with more parallel trenches to protect and conceal the attacking troops. After each step in the process the besiegers would ask the besieged to surrender. If the first wave stormed the breach successfully, the defenders could expect no mercy. It was customary, from ancient history through the Middle Ages, for successful besiegers to massacre the inhabitants of any city that resisted a siege. Some conquerors, notably Tamerlane, liked to build huge mounds of skulls as monuments to their prowess.

Development The earliest known recorded use of trench warfare was employed by Muhammad as a general against the Banu Quraish army at the Battle of the Trench in 627. The idea was put forward by his companion, Salman the Persian (Salmaan Faarsi). This implies that the Sassanid Empire Persian Empire may have used trench warfare even earlier, during the Roman-Persian Wars against their arch rivals, the Byzantine Empire.

The first development that was essential for modern trench warfare however was the introduction of mass-conscripted armies during the French Revolution and the Napoleonic Wars. Prior to this, armies still consisted of small numbers of troops, which were unable to defend a large territory for very long—battles were either brief or degenerated into siege warfare. Large armies made it much more difficult for one army to outflank another, but it was still possible with cavalry and infantry charges for one army to break another by a direct assault. An example of early fortified military lines that stretched for many miles were the Lines of Torres Vedras (1810), which was built by the Portuguese under the direction of Royal Engineers of the British Army during the Peninsular war.

What made direct frontal assault increasingly suicidal was the development of improved firearm technology in the mid-19th century. When the American Civil War began in 1861, it was fought with Napoleonic War tactics. By 1863, it had many of the charicteristics of the World War I, including trenches, rifles, rapid-fire weapons (in WW1, machine guns), field fortifications, and massive casualties. The Battle of Petersburg, near the end of the war, with its trenches and static formations, contrasts sharply with the early battles, such as the First Battle of Bull Run, where manoeuvre was still possible; famous charges, such as Pickett's Charge's at the Battle of Gettysburg, revealed the futility of direct assault on an entrenched opposing line.

: Union Army Soldiers of 6th Corps, Army of the Potomac, in trenches before storming Marye's Heights at the 2nd Battle of Fredericksburg during the Chancellorsville campaign, Virginia, May 1863Several factors were responsible for the change. First, there was the proliferation of rifles (such as the .58 (14.7mm) Springfield Rifle), manufactured in the thousands. Effective at double the range of the typical smoothbore of the Napoleon (and able to kill a man at over 1000 m), they enabled men sheltering in a trench or behind an improvised obstacle to hold a body of attackers at a much greater distance than before; attackers were unable to cross the swept zone rapidly enough to avoid prohibitive casualties. Rifles had been used with considerable success in the American Revolution and War of 1812, but were slow to reload and often personal hunting weapons of frontiersmen. By the 1850s, the Minié ballActually a conoidal bullet allowed rifles, already widely adopted, to become very much more lethal. Second was the persistence of essentially Napoleonic columnar tactics, which magnified losses; only late in the war did Infantry tactics#Squad (or skirmish line) become standard. Thus, the first response to increased firepower (taking cover) and the second (dispersal of troops) were eventually adopted. The third (armour) was not then an option, as it had been in the face of longbow or Mongol bows; the fourth, speed (crossing the swept zone faster), was not either, for the fastest battlefield transport was the horse, and cavalry proved as vulnerable as infantry to the new weapons. This would persist into World War One.

Other factors appearing after the end of the American Civil War played a part. The first was the development of barbed wire (invented in 1874), which in itself did little harm to anyone but—crucially—could slow the progress of an attacking force and thus enable emplaced gunners to inflict crippling losses. A second was the improvement of artillery. Artillery in one form or another had been a part of warfare since classical times, and from the rise of gunpowder until the development of trench warfare in the 1860s had been the major killing force; it was supplanted only temporarily by the rifle. With the development of steel Breech-loading weapon by Krupp, however, much of its former power was restored (as graphically demonstrated in the Franco-Prussian War of 1870–71). Third was the introduction of Shell (projectile)#High Explosive .28HE.29, which amplified killing power up to sixteenfold. Fourth, hydraulic recoil mechanisms, pioneered by the French Canon de 75 modèle 1897 (the famed "French 75") significantly increased the rate of fire and accuracy. These magnified the effectiveness of artillery to a degree unimaginable in the 1870s. The swept zone between attacker and defender became a "no man's land", too lethal to cross. Finally, and most often ignored, was the introduction of telephone communication, which freed batteries from artillery spotting, widening artillery usefulness in indirect fire and speeding shifting of targets.

Implementation sentry in a trench near La Boisselle during the Battle of the Somme (1916), July 1916Although firearms technology and the conscript army dramatically changed the nature of warfare, most armies were completely unaware of the implications of these changes and were not prepared for their consequences. As early as 1864, the opposing armies in the American Civil War were entrenched near Petersburg, Virginia for months, and tactics which were later to be tried in Europe, such as subterranean mines, were employed to break the stalemate -- to little effect.

At the start of World War I, most armies prepared for a brief war whose strategy and tactics would have been familiar to Napoleon. Indeed, a number of cavalry units were brought to the front by train, commanded by officers who did not imagine the factors that would render them useless. Most of these units were never deployed. However, as war broke out, Germany and Allied (mostly France and United Kingdom) forces soon learned that with modern weapons even a shallow scrape in the soil could be defended by a handful of infantry. To attack frontally was to court crippling losses, so an outflanking operation was essential. After the First Battle of the Aisne in September 1914, an extended series of attempted flanking moves, and matching extensions to the fortified defensive lines, soon saw the celebrated "race to the sea"; German and Allied armies produced essentially a matched pair of trench lines from the Swiss border in the south to the North Sea coast of Belgium. Trench warfare prevailed on the Western Front (World War I) from September 16, 1914, until the Germans launched their "Spring Offensive", Operation Michael, on March 21, 1918.

On the Western Front, the small improvised trenches of the first few months rapidly grew deeper and more complex, gradually becoming vast areas of interlocking defensive works. The space between the opposing trenches was referred to as "no man's land" (for its lethal uncrossability) and varied in width depending on the battlefield. On the Western Front it was typically between 100 and 300 yards (90-275 m), though only 30 yards (27 m) on Battle of Vimy Ridge. After the German withdrawal to the Hindenburg line in March 1917, it stretched to over a kilometre in places. At the infamous "Quinn's Post" in the cramped confines of the Anzac battlefield at Battle of Gallipoli, the opposing trenches were only 15 m (16yd) apart and a grenade war was waged there incessantly. On the Eastern Front (World War I) and in the Middle East, the areas to be covered were so vast, and the distances from the factories that supplied shells, bullets, concrete and barbed wire so great, that trench warfare in the European style often did not eventuate.

In the Alps the trench warfare even stretched into the 3rd dimension, on vertical slopes and deep into the mountains, up to heights of 3900 m (12795 ft) above sea level (the Ortler had an artillery position on its summit near the front line). The trench-line management and trench profiles had to be adapted to the rough terrain, the hard rock, and the harsh weather conditions. Many trench systems were constructed within glaciers like the Adamello-Presanella group or the famous city below the ice on the Marmolada in the Dolomites.

Defensive system , in communication trench near Beaumont Hamel, Somme, 1916

Very early in the war the British defensive doctrine suggested a main trench system of three parallel lines, interconnected by communications trenches. The point at which a communications trench intersected the front trench was of critical importance, and it was usually heavily fortified. The front trench was lightly garrisoned and typically only occupied in force during "stand to" at dawn and dusk. Between 70 and 100 yards (64-91 m) behind the front trench was located the support (or "travel") trench, to which the garrison would retreat when the front trench was bombarded. Between 300 and 500 yards (275-460 m) further to the rear was located the third reserve trench, where the reserve troops could amass for a counter-attack if the front trenches were captured. This defensive layout was soon rendered obsolete as the power of the artillery grew; however, in certain sectors of the front, the support trench was maintained as a decoy to attract the enemy bombardment away from the front and reserve lines. Fires were lit in the support line to make it appear inhabited, and any damage due immediately repaired.



Temporary trenches were also built. When a major attack was planned, assembly trenches would be dug near the front trench. These were used to provide a sheltered place for the waves of attacking troops who would follow the first waves leaving from the front trench. "Saps" were temporary, unmanned, often dead-end utility trenches dug out into no-man's land. They fulfilled a variety of purposes, such as connecting the front trench to a listening post close to the enemy wire or providing an advance "jumping-off" line for a surprise attack. When one side's front line bulged towards the opposition, a "salient (military)" was formed. The concave trench line facing the salient was called a "re-entrant." Large salients were perilous for their occupants because they could be assailed from three sides.

Behind the front system of trenches there were usually at least two more partially prepared trench systems, kilometres to the rear, ready to be occupied in the event of a retreat. The Germans often prepared multiple redundant trench systems; in 1916 their Somme front featured two complete trench systems, one kilometre apart, with a third partially completed system a further kilometre behind. This duplication made a decisive breakthrough virtually impossible. In the event that a section of the first trench system was captured, a "switch" trench would be dug to connect the second trench system to the still-held section of the first. The Germans made something of a science out of designing and constructing defensive works. They used reinforced concrete to construct deep, shell-proof, ventilated dugouts, as well as strategic strongpoints. They were more willing than their opponents to make a strategic withdrawal to a superior prepared defensive position. They were also the first to apply the concept of "defence in depth," where the front-line zone was hundreds of yards deep and contained a series of redoubts rather than a continuous trench. Each redoubt could provide supporting fire to its neighbours, and while the attackers had freedom of movement between the redoubts, they would be subjected to withering enfilade fire. The British eventually adopted a similar approach, but it was incompletely implemented when the Germans launched the 1918 "Spring Offensive" and proved disastrously ineffective. France, by contrast, relied on artillery and reserves, not entrenchment. The characteristic barbed wire placed before trenches, in belts 15 m (50 ft) deep or more, differed, too; the German wire was heavier gauge, and British wire cutters (designed for the thinner native product) were unable to cut it.Canada's Army, p.79.

Trench construction

Trenches were never straight but were dug in a zigzaging pattern that broke the line into bays connected by traverses. This meant that a soldier could never see more than 10 metres (30 ft) or so along the trench. The trenches were dug like this so an enemy would not be able to attack from the sides thus causing major damage. Consequently, the entire trench could not be enfiladed if the enemy gained access at one point; or if a bomb or shell landed in the trench, the fragmentation (weaponry) (often called shrapnel) could not travel far. Another bonus for building trenches in a zig zag pattern was that if enemy aircraft were sent to gather intelligence for artillery strikes, it would be harder for them to accurately give co-ordinates for zig zagging trenches than straight trenches. The side of the trench facing the enemy was called the parapet and had a fire step. The rear of the trench was called the parados. The parados protected the soldier's back from fragmentation from shells falling behind the trench. If the enemy captured the trench, then the parados would become their "parapet". The sides of the trench were revetted with sandbags, wooden frames and wire mesh. The floor of the trench was usually covered by wooden duckboards.

Dugouts of varying degrees of luxury would be built in the rear of the support trench. British dugouts were usually 8 to 16 feet (2.5-5 m) deep, whereas German dugouts were typically much deeper, usually a minimum of 12 feet (3.6 m) deep and sometimes dug three stories down, with concrete staircases to reach the upper levels. "Luxury" was a relative term when prolonged rain reduced the floor and walls to mud.

man using a periscope rifle, Gallipoli 1915

To allow a soldier to see out of the trench without exposing his head, a loophole would be built into the parapet. A loophole might simply be a gap in the sandbags, or it might be fitted with a steel plate. German snipers used armour-piercing bullets that allowed them to penetrate loopholes. The other means to see over the parapet was the trench periscope—in its simplest form, just a stick with two angled pieces of mirror at the top and bottom. In the Anzac trenches at Gallipoli, where the Turkey held the high ground, the periscope rifle was developed to enable the Australians and New Zealanders to snipe at the enemy without exposing themselves over the parapet.

There were three standard ways to dig a trench: entrenching, sapping, and tunnelling. Entrenching, where a man would stand on the surface and dig downwards, was most efficient, as it allowed a large digging party to dig the full length of the trench simultaneously. However, entrenching left the diggers exposed above ground and hence could only be carried out when free of observation, such as in a rear area or at night. Sapping involved extending the trench by digging away at the end face. The diggers were not exposed, but only one or two men could work on the trench at a time. Tunnelling was like sapping except that a "roof" of soil was left in place while the trench line was established and then removed when the trench was ready to be occupied. The guidelines for British trench construction stated that it would take 450 men 6 hours (at night) to complete 250 m (275yd) of front-line trench system. Thereafter, the trench would require constant maintenance to prevent deterioration caused by weather or shelling.



The battlefield of Flanders, which saw some of the worst fighting, presented numerous problems for the practice of trench warfare, especially for the British, who were often compelled to occupy the low ground. Heavy shelling quickly destroyed the network of ditches and water channels which had previously drained this low-lying area of Belgium. In most places, the water table was only a metre or so below the surface, meaning that any trench dug in the ground would quickly flood. Consequently, many "trenches" in Flanders were actually above ground and constructed from massive breastworks of sandbags (actually filled with clay). Initially, both the parapet and parados of the trench were built in this way, but a later technique was to dispense with the parados for much of the trench line, thus exposing the rear of the trench to fire from the reserve line in case the front was breached.

Trench geography The confined, static, and subterranean nature of trench warfare resulted in it developing its own peculiar form of geography. In the forward zone, the conventional transport infrastructure of roads and rail were replaced by the network of trenches and light tramways. The critical advantage that could be gained by holding the high ground meant that minor hills and ridges gained enormous significance. Many slight hills and valleys were so subtle as to have been nameless until the front line encroached upon them. Some hills were named for their height in metres, such as Battle of Hill 60 (Western Front). A farmhouse, windmill, quarry, or copse of trees would become the focus of a determined struggle simply because it was the largest identifiable feature. However, it would not take the artillery long to obliterate it, so that thereafter it became just a name on a map.

s training with a flamethrower near Sedan, France, May 1917

Battlefield features could be given a descriptive name ("Polygon Wood" near Ypres or "Battle of Lone Pine"), a whimsical name ("Sausage Valley" and "Mash Valley" on the Somme), a unit name ("Inniskilling Inch" at Helles named for the Royal Inniskilling Fusiliers) or the name of a soldier ("Monash Valley" at Anzac Cove named after General John Monash). Prefixing a feature with "Dead Man's" was also popular for obvious reasons, such as "Dead Man's Road" leading in to Pozières, or "Dead Man's Ridge" at Anzac Cove. There were numerous trench networks named "The Chessboard" or "The Gridiron" because of the pattern they described. For the Australians at Battle of Mouquet Farm, the advances were so short and the terrain so featureless that they were reduced to naming their objectives as "points" on the map, such as "Point 81" and "Point 55."Enemy trenches, which would become objectives in an attack, needed to be named as well. Many were named for some observed event such as "German Officers' Trench" at Anzac Cove (where a couple of German officers were sighted) or "Ration Trench" on the Somme (where German ration-carrying parties were sighted). The British gave an alcoholic flavour to the German trenches in front of Ginchy: "Beer Trench," "Bitter Trench," "Hop Trench," "Ale Alley," and "Pilsen Trench." Other objectives were named according to their role in the trench system, such as the "Switch Trench" and "Intermediate Trench" on the Somme. Some sections of the British trench system read like a Monopoly (game) board, with names such as "Park Lane" and "Bond Street," British regular divisions habitually named their trenches after units, which resulted in names such as "Munster Alley" (Royal Munster Fusiliers), "Black Watch Alley" (Black Watch) and "Border Barricade" (Border Regiment). The Australian and New Zealand Army Corpss tended to name features after soldiers ("Plugge's Plateau," "Walker's Ridge," "Quinn's Post," "Johnston's Jolly," "Russell's Top," "Brind's Road" and so forth).

Life in the trenches An individual soldier's time in the front-line trench was usually brief; from as little as one day to as much as two weeks at a time before being relieved. The Australian 31st Battalion once spent 53 days in the line at Villers Bretonneux, but such a duration was a rare exception. A typical British soldier's year could be divided as follows:

• 15% front line
• 10% support line
• 30% reserve line
• 20% rest
• 25% other (hospital, traveling, leave, training courses, etc.)

Even when in the front line, the typical soldier would only be called upon to engage in fighting a handful of times a year—making an attack, defending against an attack or participating in a raid. The frequency of combat would increase for the men of the "elite" fighting divisions—on the Allied side; the British regular divisions, the Canadian Corps, the French XX Corps and the Australian and New Zealand Army Corpss.

Some sectors of the front saw little activity throughout the war, making life in the trenches comparatively easy. When the I Anzac Corps first arrived in France in April 1916 after the evacuation of Gallipoli, they were sent to a relatively peaceful sector south of Armentières to "acclimatise". Other sectors were in a perpetual state of violent activity. On the Western Front, Ypres was invariably hellish, especially for the British in the exposed, overlooked salient. However, quiet sectors still amassed daily casualties through sniper fire, artillery, disease, and poison gas. In the first six months of 1916, before the launch of the Somme Offensive, the British did not engage in any significant battles on their sector of the Western Front and yet suffered 107,776 casualties.

A sector of the front would be allocated to an army corps, usually comprising three division (military)s. Of these two divisions would occupy adjacent sections of the front and the third would be in rest to the rear. This breakdown of duty would continue down through the army structure, so that within each front-line division, typically comprising three infantry brigades (regiments for the Germans), two brigades would occupy the front and the third would be in reserve. Within each front-line brigade, typically comprising four battalions, two battalions would occupy the front with two in reserve. And so on for companies and platoons. The lower down the structure this division of duty proceeded, the more frequently the units would rotate from front-line duty to support or reserve.



During the day, snipers and artillery observers in balloons made movement perilous, so the trenches were mostly quiet. Consequently, the trenches were busiest at night, when cover of darkness allowed the movement of troops and supplies, the maintenance and expansion of the barbed wire and trench system, and reconnaissance of the enemy's defenses. Sentries in listening posts out in no man's land would try to detect enemy patrols and working parties or indications that an attack was being prepared.

Pioneered by the Princess Patricia's Canadian Light Infantry in February 1915,Canada's Army, p.82. trench raids were carried out in order to capture prisoners and "booty"—letters and other documents to provide intelligence about the unit occupying the opposing trenches. As the war progressed, raiding became part of the general British policy, the intention being to maintain the fighting spirit of the troops and to deny no man's land to the Germans. As well, they were intended to force the enemy to reinforce, which exposed his troops to artillery fire.ibid. Such dominance was achieved at a high cost, when the enemy replied with his own artillery,ibid. and a post-war British analysis concluded the benefits were probably not worth the cost. Early in the war, surprise raids would be mounted, particularly by the Canadas, but increased vigilance made achieving surprise difficult as the war progressed. By 1916, raids were carefully planned exercises in combined arms and involved close co-operation of infantry and artillery. A raid would begin with an intense artillery bombardment designed to drive off or kill the front-trench garrison and cut the barbed wire. Then the bombardment would shift to form a "box", or cordon, around a section of the front line to prevent a counter-attack intercepting the raid. However, the bombardment also had the effect of notifying the enemy of the location of the planned attack, thus allowing reinforcements to be called in from wider sectors.

Death in the trenches soldiers capture a Germany trench with guns and grenades. Circa 1945.The intensity of World War I trench warfare meant about 10% of the fighting soldiers were killed. This compared to 5% killed during the Second Boer War and 4.5% killed during World War II. For British and Dominion troops serving on the Western Front, the proportion of troops killed was 12%, while the total proportion of troops who became casualties (killed or wounded) was 56%. Considering that for every front-line infantryman there were about three soldiers in support (artillery, supply, medical, and so on), it was highly unlikely for a fighting soldier to survive the war without sustaining some form of injury. Indeed many soldiers were injured more than once during the course of their service.

Medical services were primitive and life-saving antibiotics had not yet been discovered. Relatively minor injuries could prove fatal through onset of infection and gangrene. The Germans recorded that 12% of leg wounds and 23% of arm wounds resulted in death, mainly through infection. The United States recorded 44% of casualties who developed gangrene died. Half of those who were wounded in the head died and only 1% of those wounded in the abdomen survived. Three-quarters of wounds inflicted during the war came from shell fire. The wound resulting from a shell fragment was usually more traumatic than a gunshot wound. A shell fragment would often introduce debris making it more likely that the wound would become infected. These factors meant a soldier was three times more likely to die from a shell wound to the chest than from a gunshot wound. The blast from shell explosions could also kill by concussion. In addition to the physical effects of shell fire, there was the psychological damage. Men who had to endure a prolonged bombardment would often suffer debilitating shell shock, a condition not well understood at the time. (It is now usually called Post Traumatic Stress Disorder and is better, but still not well, understood.)

As in many other wars, World War I's greatest killer was disease. sanitation conditions in the trenches were quite poor, and common infections included dysentery, typhus, and cholera. Many soldiers suffered from parasites and related infections. Poor hygiene also led to fungal conditions, such as trench mouth and trench foot. Another common killer was exposure, since the temperature within a trench in the winter could easily fall below zero degrees Celsius (32 °F). Burial of the dead was usually a luxury that neither side could easily afford. The bodies would lie in no man's land until the front line moved, by which time the bodies were often unidentifiable. On some battlefields, such as at Battle of the Nek in Gallipoli, the bodies were not buried until after the war. On the Western Front, bodies continue to be found as fields are ploughed and building foundations dug.



At various times during the war—particularly early on—official truces were organised so that the wounded could be recovered from no man's land and the dead could be buried. Generally, senior commands disapproved of any slackening of the offensive for humanitarian reasons and so ordered their troops not to permit enemy stretcher-bearers to operate in no man's land. However, this order was almost invariably ignored by the soldiers in the trenches, who knew that it was to the mutual benefit of the fighting men of both sides to allow the wounded to be retrieved. So, as soon as hostilities ceased, parties of stretcher bearers, marked with Red Cross (symbol) flags, would go out to recover the wounded, sometimes swapping enemy wounded for their own. There were occasions when this unofficial cease fire was exploited to conduct a reconnaissance or to reinforce or relieve a garrison. One famous truce was the Christmas truce between British and German soldiers in the winter of 1914 on the front near Armentieres. German soldiers began singing Christmas carols and soon soldiers left their trenches. The soldiers exchanged gifts and stories, and played several games of football. As mentioned previously, the commanders of the warring nations disapproved of this cease fire, and the British court-martialed several of their soldiers. The spirit of this truce is portrayed in the 2005 movie Merry Christmas (film) (Joyeux Noël).

Weapons of trench warfare Infantry weapons The common infantry soldier had four weapons to use in the trenches: the rifle, bayonet, shotgun, and hand grenade. The standard issue British rifle was the .303 Short Magazine Lee-Enfield (SMLE), originally developed as a cavalry carbine, with a maximum range of 1400yd (1280 m). The Ross rifle was widely used by the Canadian Corps early in the war and was reputedly more accurate than the British SMLE. However, it proved notoriously unreliable under battlefield conditions, often jamming when dirty or fired rapidly, and was gradually discarded for routine use in favour of the SMLE, except for sniping. Early in the war, the British were able to defeat German attacks at Battle of Mons and the First Battle of Ypres with massed rifle fire, but as trench warfare developed, opportunities to assemble a line of riflemen disappeared.

The German counterpart to the Lee-Enfield was the 7.92x57mm (.323") Mauser Gewehr 98. It was less suited to rapid fire than the SMLE, due to its smaller magazine and slower rate of fire. The British soldier was equipped with a 21-inch (53 cm) sword bayonet, which was too long and unwieldy to be particularly effective in close-quarters combat. However, bayonet use was safer than firing the rifle which, in a mêlée, might strike an ally instead of an enemy. British figures recorded only 0.3% of wounds were caused by bayonets; however, a strike from a bayonet was likely to result in death. The bayonet was also used to finish off wounded enemy soldiers during an advance, both saving ammunition and reducing the probability of being attacked from the rear. Imperial German soldiers generally carried the S98/05 "Butcher-blade" bayonet, which was an effective weapon in the open, but like the British bayonet, difficult to use in the narrow trenches when attached to a rifle.

Many soldiers preferred a short-handled spade or entrenching tool over a bayonet. They would sharpen the blade so it was just as effective as a bayonet, and the shorter length made them handier to use in the confined quarters of the trenches. These tools could then be used to dig in after they had taken a trench. Since the troops were often not adequately equipped for trench warfare, improvised weapons were common in the first encounters, such as short wooden clubs and metal Mace (club)s, as well as trench knives and brass knuckles (see trench raiding). As the war progressed, better equipment was issued, and improvised arms were discarded.

Used by American soldiers in the Western front, the pump action shotgun was a formidable weapon in short range combat, enough so that Germany lodged a formal protest against their use on 14 September 1918, stating "every prisoner found to have in his possession such guns or ammunition belonging thereto forfeits his life" (though this threat was apparently never carried out). The U.S. military began to issue models specially modified for combat, called "trench guns", with shorter barrels, higher capacity magazines, no Shotgun#Pattern and choke, and often heat shields around the barrel, as well as lugs for the M1917 bayonets. Australian and New Zealand Army Corps and some British soldiers were also known to use sawn-off shotguns in trench raids, because of their portability, effectiveness at close range, and ease of use in the confines of a trench. This practice was not officially sanctioned, and the shotguns used were invariably modified sporting guns.

The hand grenade came to be the primary infantry weapon of trench warfare. Both sides were quick to raise specialist bombing squads. The grenade enabled a soldier to engage the enemy without exposing himself to fire, and it did not require precise accuracy to kill or maim. The Germans and Turks were well equipped with grenades from the start of the war, but the British, who had ceased using grenadiers in the 1870s and did not anticipate a siege war, entered the conflict with virtually none, so soldiers had to improvise bombs with whatever was available. By late 1915, the British Mills bomb had entered wide circulation, and by the end of the war 75 million had been used.

Machine guns The machine gun is perhaps the signature weapon of trench warfare, with the image of ranks of advancing infantry being scythed down by the withering hail of bullets. The Germans embraced the machine gun from the outset—in 1904, sixteen units were equipped with Maschinengewehr—and the machine gun crews were the elite infantry units; these units were attached to Jaeger (light infantry) battalions. By 1914, British infantry units were armed with two Vickers machine guns per battalion, the Germans had six per battalion, the Russians eight. As for the Americans, they had to wait until 1917 to see every infantry unit carry at least one machine gun. After 1915, the Maschinengewehr 08 was the standard issue German machine gun; its number entered the German language as idiomatic for "dead plain". At Gallipoli and in Palestine the Turks provided the infantry, but it was usually Germans who manned the machine guns.

The British High Command were less enthusiastic about machine guns, supposedly considering the weapon too "unsporting" and encouraging defensive fighting; and they lagged behind the Germans in adopting it. Field Marshall Sir Douglas Haig is quoted as saying in 1915, "The machine gun is a much overrated weapon; two per battalion is more than sufficient", which resulted in record numbers of British casualties. In 1915 the Machine Gun Corps was formed to train and provide sufficient heavy machine gun teams. It was the Canadians that made the best practice, pioneering area denial and indirect fire (soon adopted by all Allied armies) under the guidance of former French Army Reserve officer Major General Raymond Brutinel. Minutes before the attack on Vimy Ridge the Canadians also thickened the artillery barrage by aiming machine guns at the precise angle to rain down on the Germans, they also significantly increased the amount of machine guns per battalion. To match demand, production of the Vickers machine gun was contracted to firms in the United States. By 1917, every company in the British forces were also equipped with four Lewis guns, which significantly enhanced their firepower.



The heavy machine gun was a specialist weapon, and in a static trench system was employed in a scientific manner, with carefully calculated fields of fire, so that at a moment's notice an accurate burst could be fired at the enemy's parapet or a break in the wire. Equally it could be used as light artillery in bombarding distant trenches. Heavy machine guns required teams of up to eight men to move them, maintain them, and keep them supplied with ammunition. This made them impractical for offensive maneuvers, contributing to the stalemate on the Western Front.

Mortars Mortar (weapon)s, which lobbed a shell in a high arc over a relatively short distance, were widely used in trench fighting for harassing the forward trenches, for cutting wire in preparation for a raid or attack, and for destroying dugouts, saps and other entrenchments. In 1914, the British fired a total of 545 mortar shells; in 1916, they fired over 6,500,000.

The main British mortar was the Stokes mortar, precursor of the modern mortar. It was a light mortar, but was easy to use, and capable of a rapid rate of fire by virtue of the propellant cartridge being attached to the shell. To fire the Stokes mortar, the round was simply dropped into the tube, where the cartridge was ignited automatically when it struck the firing pin at the bottom. The Germans used a range of mortars. The smallest were grenade-throwers (Granatenwerfer) which fired "pineapple" bombs. Their medium trench-mortars were called mine-throwers (Minenwerfer), dubbed "moaning minnies" by British Commonwealth troops. The heavy mortar was called the Ladungswerfer, which threw "aerial torpedoes", containing a 200 lb (90 kg) charge to a range of 1000yd (914 m). The flight of the missile was so slow and leisurely men on the receiving end could make some attempt to seek shelter.

Artillery Artillery dominated the battlefield of trench warfare in the same way air power dominates the modern battlefield. An infantry attack was rarely successful if it advanced beyond the range of its supporting artillery. In addition to bombarding the enemy infantry in the trenches, the artillery could be used to cover infantry advances with creeping barrage or box barrages, or engage in counter-battery duels to try to destroy the enemy's guns. Artillery mainly fired fragmentation (weaponry), high explosive, or, later in the war, gas shells. The British experimented with firing thermite incendiary shells to set trees and ruins alight.



Artillery pieces were of two types: guns and howitzers. Guns fired high-velocity shells over a flat trajectory and were often used to deliver fragmentation and to cut barbed wire. Howitzers lofted the shell over a high trajectory so it plunged into the ground. The largest calibers were usually howitzers. The German 420 mm howitzer weighed 20 tons and could fire a one-ton shell over 10 km. A critical feature of period artillery pieces was the hydraulic recoil mechanism, which meant the gun did not need to be re-laid (re-aimed) after each shot. Initially each gun would need to register its aim on a known target, in view of an observer, in order to fire with precision during a battle. The process of gun registration would often alert the enemy an attack was being planned. Towards the end of 1917, artillery techniques were developed enabling fire to be delivered accurately without registration on the battlefield - the gun registration was done behind the lines then the pre-registered guns were brought up to the front for a surprise attack.

Gas Tear gas was first employed in August 1914 by the French, but this could only disable the enemy. In April 1915, chlorine was first used by Germany at the Second Battle of Ypres. A large enough dose could kill, but the gas was easy to detect by scent and sight. Those that were not killed on exposure could suffer permanent lung damage. Phosgene, first used in December 1915, was the ultimate killing gas of World War I—it was 18 times more powerful than chlorine and much more difficult to detect. However, the most effective gas was mustard gas, introduced by Germany in July 1917. Mustard gas was not as fatal as phosgene, but it was hard to detect and lingered on the surface of the battlefield and so could inflict casualties over a long period. The burns it produced were so horrific that a casualty resulting from mustard gas exposure was unlikely to be fit to fight again. Only 2% of mustard gas casualties died, mainly from secondary infections.

The first method of employing gas was by releasing it from a cylinder when the wind was favourable. Such an approach was obviously prone to miscarry if the direction of the wind was misjudged. Also, the cylinders needed to be positioned in the front trenches where they were likely to be ruptured during a bombardment. Later in the war, gas was delivered by artillery or mortar shell.

in trench, Hirtzbach Woods, Haut-Rhin, France, 1917

Helmets During the first year of the First World War, none of the combatant nations equipped their troops with steel helmets. Soldiers went into battle wearing simple cloth or leather caps that offered virtually no protection from the damage caused by modern weapons. German troops were wearing the traditional leather Pickelhaube (spiked helmet), with a covering of cloth to protect the leather from the splattering of mud. Once the war entered the static phase of trench warfare, the number of lethal head wounds that troops were receiving from fragmentation (weaponry) increased dramatically. The French were the first to see a need for greater protection and began to introduce steel helmets in the summer of 1915. The Adrian helmet (designed by August-Louis Adrian) replaced the traditional French kepi and was later adopted by the Belgian, Italian and many other armies.

At about the same time the British were developing their own helmets. The French design was rejected as not strong enough and too difficult to mass-produce. The design that was eventually approved by the British was the Brodie helmet (designed by John L. Brodie). This had a wide brim to protect the wearer from falling objects, but offered less protection to the wearer's neck. When the Americans entered the war, this was the helmet they chose, though some units used the French Adrian helmet. The traditional German pickelhaube was replaced by the Stahlhelm or "steel helmet" in 1916. Some elite Italian units used a helmet derived from ancient Roman designs. None of these standard helmets could protect the face or eyes, however. Special face-covers were designed to be used by machine-gunners, and the Belgians tried out goggles made of louvres to protect the eyes.

Wire The use of barbed wire was decisive in slowing infantry traveling across the battlefield. Without it, fast moving infantry (or cavalry) might cross the lines and reach the enemy machine gun posts and artillery. Slowed down by the barbed wire, they were much more likely to be shot down by machine guns or rifles. Liddell Hart identified barbed wire and the machine gun as the elements that had to be broken to regain a mobile battlefield. Wiring was usually done at night, to avoid casualties in no man's land. The screw picket, invented by the Germans (and later adopted by the Allies) during the war, was quieter than driving stakes, and thus helped decrease the amount of noise working parties would create. Methods to defeat it were rudimentary. British and Commonwealth forces relied on wire cutters, which proved unable to cope with the heavier gauge German wire.Canada's Army, p.79. The Bangalore torpedo was adopted by many armies, and continued in use past the end of World War II."Bangalore torpedo", in Fitzsimons, Bernard, editor, Encyclopedia of 20h Century Weapons and Warfare (London: Phoebus Publishing Company 1977), Volume 3, p.269.

Aircraft The fundamental purpose of the aircraft in trench warfare was reconnaissance and artillery observation. Aerial reconnaissance was so significant in exposing movements, it has been said the trench stalemate was a product of it."Aces: A Story of the First World War", written by George Pearson, historical advisors Brereton Greenhous & Philip Markham, National Film Board of Canada, 1993. The role of the fighter aircraft was to protect friendly reconnaissance aircraft and destroy those of the enemy, or at least deny them the freedom of friendly airspace. This involved achieving air superiority over the battlefield by destroying the enemy's fighters as well. Spotter aircraft would monitor the fall of shells during registration of the artillery. Reconnaissance aircraft would map trench lines (first with hand-drawn diagrams, later photographs), monitor enemy troop movements, and locate enemy artillery batteries so that they could be destroyed with counter-battery fire. Some ingenious pilots would carry bricks with them when going on flights in order to drop on the enemy, before dropping bombs became more commonplace.

Other weapons The Germans employed flame throwers (Flammenwerfer) during the war but as the technology was in its infancy, its value was mostly psychological.

Later in the war, the Allies sometimes used tanks to get the advantage in battle. Tanks were helpful in destroying the enemy's trenches. They could penetrate barbed wire, some could bridge trenches, and machine guns did not damage them, thus overcoming the major obstacles of trench warfare. Unfortunately, tanks of the time period were very slow, very heavy, and often mechanically unreliable. As well, they were still vulnerable to artillery fire.

Mining All sides would engage in vigorous mining and counter-mining duels. The dry chalk of the Somme was especially suited to mining, but with the aid of pumps, it was also possible to mine in the sodden clay of Flanders. Specialist tunneling companies, usually made up of men who had been miners in civilian life, would dig tunnels under no man's land and beneath the enemy's trenches. These mines would then be packed with explosives and detonated, producing a large crater. The crater served two purposes: it could destroy or breach the enemy's trench and, by virtue of the raised lip that they produced, could provide a ready-made "trench" closer to the enemy's line. When a mine was detonated, both sides would race to occupy and fortify the crater.

If the miners detected an enemy tunnel in progress, they would often drive a counter-tunnel, called a camouflet, which would be detonated in an attempt to destroy the other tunnel prematurely. Night raids were also conducted with the sole purpose of destroying the enemy's mine workings. On occasion, mines would cross and fighting would occur underground. The mining skills could also be used to move troops unseen. On one occasion a whole British division was moved through interconnected workings and sewers without German observation. The British detonated a number of mines on July 1, 1916, the first day of the Battle of the Somme (1916). The largest mines—the Y Sap Mine and the Lochnagar Mine—each containing 24 tons of explosives, were blown near La Boiselle, throwing earth 4,000 feet into the air.

At 3.10 AM on June 7, 1917, 19 mines were detonated by the British to launch the Passchendaele#Messines Ridge. The average mine contained 21 tons of explosive and the largest, 125 feet beneath Saint-Eloi, was twice the average at 42 tons. The combined force of the explosions was supposedly felt in England. As the Chief of Staff of the British Second Army, General Sir Charles Harrington, commented on the eve of the battle:

I do not know whether we shall change history tomorrow, but we shall certainly alter the geography.

The craters from these and many other mines on the Western Front are still visible today. Three further mines were laid for Messines but were not detonated as the t

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