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In page Mustard gas:

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Mustard gas was first used in World War I by the German army against British and Canadian soldiers near Ypres, Belgium, on July 12, 1917,[1] and later also against the French Second Army. Yperite is "a name used by the French, because the compound was first used at Ypres."[2] The Allies did not use mustard gas 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).[3][4] This was used first in September 1918 during the breaking of the Hindenburg Line.[citation needed]