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Horse wearing gas mask

"Protecting horse and man from gas attack. A marked feature in the German attack is the use of poisonous gas. The protection from the gas attack is not limited to man only, but also to the animals they have. Photo shows how the mask is fitted over the horse's nose." Photograph on June 10, 1918, by International Film Service. National Archives and Records Administration, cataloged under the National Archives Identifier (NAID) 26423966. (This image is a work of a U.S. military or Department of Defense employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain in the United States. Photograph edited by Dr. Douglas J Lanska.)