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...ory/> Chlorine gas was first introduced as a weapon on April 22, 1915 at [[Ypres]] by the [[German Army]],<ref>{{cite web |url = http://www.drcordas.com/edu ...in [[World War I]] by Germany on April 22, 1915 in the [[Second Battle of Ypres]]. As described by the soldiers it had a distinctive smell of a mixture bet