Royal Aircraft Factory F.E.8 Biplane, 1915.

Spad S XIII, in the colors of Capt. Eddie Rickenbacker, U.S. 94th Aero Squadron, French biplane figh…

The second Caproni Ca.32 (300 hp – Ca.2) at Taliedo airport. On board is Giovanni Battista "Gianni…

Australian infantry on the front line with small box respirators after gas attack at Ypres, France 1…

French soldiers wearing gas masks on the Western Front, 1916.

German Red Cross man wearing a gas mask with oxygen apparatus at the Eastern front, 1916.

Soldier wearing gas mask on the Eastern front, 1916.

French artillerymen wearing gas masks, 1917.

French soldiers wearing gas masks awaiting an attack on the Eastern front, 1916.

British soldier and horse wearing gas masks on the front, France 1917.

Rescue-brigade "Red Cross" man at Woolwich Arsenal replete with gas mask.

Canadian tank and soldiers move into enemy lines in the "Battle of Vimy Ridge" was one of the openin…

French school of experimental anti-gas warfare, 1916.

French soldiers operating a capture German flamethrower on the Western front, 1917.

Royal Irish Rifles ration party at Western front in Somme, France. July 1916.

Airco DH9 Bombers in flight,  Royal Air Force 1917.

Canadian Tank at the Western front after battle, France 1918.

Soldiers from the 5e Canadian regiment cavalry return from the Western front on top of tank, France …

American troops going forward to the battle line in the Forest of Argonne, France. September 26, 191…