U.S. soldiers in trench putting on gas masks, World War I, September 21, 1918. FASCINATING historic footage of our forefathers preparing for chemical warfare shows troops staging mock battles and preparing for gas attacks in the build up to World War One. The videos, which were captured at Camp Upton, N.Y, between 1918 and 1919, reveal soldiers going through drills including a procedure in a mock trench as well as having their reaction times tested when on a march. Other images reveal a lighter side of life at the training base, with the men partaking in a game of Baseball whilst wearing their gas masks, where Long Island can be seen in the background. Public Domain / mediadrumworld.com