Duckboards were wooden walkways laid across the bottom of World War I trenches and over muddy terrain to keep soldiers above standing water and liquid mud. Their primary purpose was simple but critical: allowing troops to move, stay healthy, and keep fighting in conditions that could otherwise immobilize or injure them. What looks like a basic slatted platform was one of the most important pieces of infrastructure in trench warfare.
Keeping Soldiers Out of the Water
Trenches on the Western Front flooded constantly. Heavy rain, high water tables (especially in low-lying Flanders), and damaged drainage systems turned trench floors into channels of standing water and thick mud. Duckboards were placed along the bottom of trenches to cover sump pits, the drainage holes dug at intervals along one side of the trench. By covering these pits, the boards gave soldiers a stable surface to walk on while still allowing water to be pumped out from underneath.
In many cases, duckboards were raised on small frames above the trench floor, creating a gap that let water and slush drain away beneath the walking surface. This kept soldiers’ feet elevated even when the trench bottom was submerged. Without them, men stood in cold, filthy water for hours or days at a time.
Preventing Trench Foot
The medical stakes were enormous. Trench foot, a painful condition caused by prolonged exposure to cold, wet conditions, became one of the war’s most widespread non-combat injuries. Feet would swell, go numb, and in severe cases develop gangrene requiring amputation. Across the war, trench foot caused roughly 75,000 casualties in the British Army alone and around 2,000 in the American forces.
Where duckboards were available and properly used, the incidence of trench foot dropped markedly. The boards didn’t need to keep feet perfectly dry to make a difference. Simply reducing the hours of direct contact with standing water was enough to lower the risk significantly. Armies treated duckboard installation as a medical preventive measure, not just a convenience.
Enabling Movement Across No Man’s Land
Duckboards weren’t limited to inside the trenches. Long tracks of them were laid across the devastated landscape between positions, stretching over ground that artillery bombardment had churned into a near-liquid swamp. These overland duckboard paths were essential for moving troops, carrying wounded soldiers to aid stations, and transporting ammunition and supplies to the front lines. Without a solid path, men carrying heavy loads could sink knee-deep or waist-deep in mud, making resupply painfully slow and exhausting.
The Battle of Passchendaele in 1917 is one of the most vivid examples. The terrain around Ypres became so waterlogged that duckboard tracks were the only reliable way to cross it. Straying off the boards, especially at night or under fire, could be fatal. Veterans recalled that wounded men who slipped off the duckboards simply sank into the mud. One officer, Lieutenant Russell Harris, described the helplessness of hearing men stuck in mud holes crying out, unable to rescue them, and the silence that followed.
How They Were Built
Duckboards were intentionally simple. A standard board consisted of wooden slats (treads) nailed across two parallel runners, creating a ladder-like platform. Treads were typically around 1,200 millimeters long and 150 millimeters wide, with 50-millimeter thickness, spaced with small gaps between them to let water pass through. The runners beneath measured about 150 by 100 millimeters. Galvanized nails held the treads in place, usually four per slat driven in at angles for grip.
For overland tracks, legs made from 100-by-100-millimeter timber were driven at least 800 millimeters into the ground to keep the structure stable. Cross members braced the legs. Chicken wire mesh was sometimes stapled across the top surface to reduce slipping, since wet wood becomes dangerously slick. The whole design prioritized speed of construction and ease of transport. Sections could be pre-assembled behind the lines and carried forward, then laid end to end across whatever ground needed covering.
The Dangers of Duckboards
For all their usefulness, duckboards introduced their own hazards. Wet, muddy wood was slippery even with wire mesh, and soldiers moving in darkness or under shellfire regularly lost their footing. A fall off a raised duckboard track in deep mud could trap a man, especially if he was wounded or weighed down with equipment. The boards themselves were also visible from the air and could draw artillery fire, since enemy forces knew that destroying a duckboard track could halt movement through an entire sector.
Maintenance was a constant struggle. Shells destroyed sections regularly, and wood rotted quickly in waterlogged soil. Engineers and labor battalions spent enormous effort replacing damaged or sunken boards, often under dangerous conditions. Despite these problems, the alternative of no duckboards at all was far worse.
Duckboards Beyond the Trenches
The concept outlived the war. Today, the same basic principle shows up in wetland boardwalks, nature trails, and construction sites. The U.S. Forest Service uses elevated timber walkways (called puncheon) on heavily trafficked trails through wet areas, built from sawn lumber treated with wood preservative and designed to meet accessibility guidelines. Industrial sites use metal grating for similar purposes. The core idea, raising a walking surface above wet or unstable ground, remains unchanged more than a century after soldiers first laid wooden slats across the mud of the Western Front.