The enduring image of World War I is of men stuck in muddy trenches, and of vast armies deadlocked in a fight neither could win. It was a war of barbed wire, poison gas, and horrific losses as officers led their troops on mass charges across No Man’s Land and into a hail of bullets. While these impressions are all too true, they hide the fact that trench warfare was dynamic and constantly evolving throughout the war as all armies struggled to find a way to break through the opposing lines.

Needless to say, the First World War came at an unfortunate time for those who would fight in it. After an initial period of relatively rapid maneuver during which the German forces pushing through Belgium and the French and British forces attempting to stymie them made an endless series of abortive flanking movements that extended the lines to the sea, a stalemate naturally tended to develop. The infamous trench lines soon snaked across the French and Belgian countryside, creating an essentially futile static slaughterhouse whose sinister memory remains to this day. Until the war of maneuver returned in 1918 and led to a decisive outcome for the war, the nexus of this horror lay in the rainy, sodden levels and low ridges of Flanders, near the medieval town of Ypres. In this tiny fragment of Europe, half a million men died over the course of three major battles and the times of attrition between, perishing in a squelching pit of mud, blood-tinged water, and rotting human flesh.

With the exception of a few hours on Christmas Day 1914, the shelling, sniping, raids, and bloodshed at Ypres in Belgium never ceased from the moment of first contact between the British Expeditionary Force (BEF) and the Imperial German army. The Ypres salient had formed the previous year during the “race to the sea,” when the opposing armies tried and failed to outflank each other in a series of maneuvers and counter-maneuvers.