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
United States Army Gas School United States Army Gas School The United States Army Gas School was established during World War I at Camp A.A. Humphreys in Virginia. The first courses began in May 1918 and the school was designed to instruct commissioned and noncommissioned officers in chemical warfare. In late October 1917 the War College was badly underprepared for large-scale chemical warfare in World War I. With many U.S. soldiers operating in a chemical environment with no knowledge of chemical warfare the War College requested a British gas officers and NCOs, the requests were granted. The British experts arrived and were directed and coordinated