By April 1915, the Western Front was mired in trench warfare. Germany’s new Chief of Staff, General Erich von Falkenhayn, didn’t think his army could break the deadlock, and Germany needed to help struggling Austro-Hungarian forces in the East. Before the Germans turned against Russia though, they decided to attack in the West to keep the Allies off balance. They chose to strike at the vulnerable Ypres Salient – and they would support the coming offensive with a weapon their enemies had never seen.