Sulfur mustard later also against the French Second Army. The name Yperite comes from its usage by the German army near the town of Ypres. The Allies did not use mustard agent until November 1917 at Cambrai, France, after the armies had captured a stockpile of German mustard shells. It took the British more than a year to develop their own mustard agent weapon, with production of the chemicals centred on Avonmouth Docks. (The only option available to the British was the Despretz–Niemann–Guthrie process). This was used first in September 1918 during the breaking of the Hindenburg Line. Mustard agent was dispersed
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