22 Apr 1915 Jahr - Battle of ypres
During World War I, the Second Battle of Ypres was fought from 22 April – 25 May 1915 for control of the strategic Flemish town of Ypres in western Belgium after the First Battle of Ypres the previous autumn. It was the first mass use by Germany of poison gas on the Western Front.The Second Battle of Ypres ended on May 25, with insignificant gains for the Germans. The introduction of poison gas, however, would have great significance in World War I. Immediately after the German gas attack at Ypres, the French and British began developing their own chemical weapons and gas masks.
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Wars of world war one