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.

The arms race before the war and the attempt to break the deadlock of the Western and Eastern Fronts by any means possible changed the face of battle in ways that would have previously been deemed unthinkable. Before 1914, flying machines were objects of public curiosity; the first flights of any account on rotor aircraft had been made less than five years before and were considered to be the province of daredevils and lunatics. By 1918, all the great powers were fielding squadrons of fighting aircraft armed with machine-guns and bombs, to say nothing of light reconnaissance planes.

Tanks, a common feature on the battlefield by 1918, had not previously existed outside of the realm of science-fiction stories written by authors like H.G. Wells. Machine guns had gone from being heavy, cumbersome pieces with elaborate water-cooling systems to single-man-portable, magazine-fed affairs like the Chauchat, the Lewis Gun, and the M1918 BAR.