Photos That Captured the Most Chilling Moments in History

Germany, 1916

Two German soldiers and their mule don gas masks during WWI. This mule was given a gas mask to prevent it from inhaling a chemical called phosgene, which was used in weapons during the war. Of the one million British horses sent overseas to help with the war effort, only 62,000 returned home.

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Post originally appeared on Upbeat News.