Loos 1915: The British Respond with Gas to Germany's First Gas Attack

German Soldiers Among Some of the Allied Gas
Casualties During the Second Battle of Ypres

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First Gas: Second Ypres, 22 April 1915

Response: Loos, 24 September 1915

Loos Battlefield

British Soldiers Advancing through the Gas

British Advance During the Battle

Source: Chemical Warfare in World War I: The American Experience, 1917-1918, U.S. Army, 1984