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April 22- May 5 Second Battle of Ypres. Chemical weapons used for the first time. (8h 8min, apr 22, 1915 y – 23h 35min, may 5, 1915 y)

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Timeline of the Great War

17 Oct 2017

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8h 8min, apr 22, 1915 y

23h 35min, may 5, 1915 y

~ 13 days

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