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Technique to clear heavier-than-air gas (eg, chlorine) from trenches in World War I (1918)

U.S. Chemical Warfare Service drills, World War I (1918). (Source: War Department. Army War College. Historical Section. National Archives and Records Administration, cataloged under the National Archives Identifier (NAID) 55163715. 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.)

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