British war crimes September 1915 and continued their usage for the remainder of the war. This was done in retaliation for the use of chlorine by Imperial German Army the preceding April. Following the Imperial German Army's use of poison gas at Ypres, the commander of II Corps, Lieutenant General Sir Charles Ferguson, had said of poison gas: Mustard gas was first used effectively in World War I by the German army against British and Canadian soldiers near Ypres, Belgium, in 1917 and later also against the French Second Army. The name "Yperite" comes from its usage by the German army near the
Action of 22 October 1917 Action of 22 October 1917 The Action of 22 October 1917 was an attack during the Third Battle of Ypres in the First World War by the British Fifth Army and the French First Army against the German 4th Army. British attacks had been repulsed at Passchendaele by the 4th Army at the Battle of Poelcappelle (9 October) and the First Battle of Passchendaele (12 October). While the British waited for another dry spell and the completion of plank roads up to the new front line, the Canadian Corps and fresh British divisions were transferred to Flanders by the British