Photo of Company A of the Hellfire Boys, the 30th Engineers (Gas and Flame), later renamed the 1st Gas Regiment.
Photo of Stokes mortar show in Oct. 1918 at Chaumont, France.
Lt. Col. B.C Goss setting off smoke bombs in the Argonne Forest in October 1918.
An artillery division under gas shell bombardment in October 1918 in Varennes-en-Argonnes, Meuse, France.
A Stokes mortar battery of Company C, 1st Gas Regiment, loading thermite and phosphorus shells in Le Neufour, Meuse, France in late October 1918.
Masked squad preparing to disinfect a mustard-filled shell hole at Hanlon Field, the American Expeditionary Forces' experimental field at Chaumont, France. Photo was taken after the Armistice, in December 1918.
A pile of uniforms removed from men exposed to mustard, taken at Croix de Charmont, France, in late August 1918.
U.S. Marines learning how to put on gas masks in France in January 1918.
Medical attendant giving water to a gassed soldier in the 82nd and 89th Division north of Royaumeix, France, in late 1918.
Soldiers in the 6th Infantry Division advancing through a gas cloud in a practice maneuver in in 1919.
No-mans-land, the battlefield between the Allied and German lines. Location unknown.