John Haldane was a scientist who tested deadly chemicals on himself in his home in 1915, in the race to develop the gas mask.

CHEYENNE, Wyo. (AP) — A World War I gas mask stolen from the Wyoming Capitol and missing for almost a century is on display in Cheyenne again after a South Dakota pawn shop donated it back to ...

Each of the French soldiers in the Argonne now has a felt mask that fits over the nose and mouth, and in the crevices of this mask is a whitish powder which neutralizes the German gas, thought to ...

(The German army would remain majority horse-drawn through World War II.) Between 1916 and 1918, gas hospitalized 2,200 horses and killed 211, mostly because logistical uses limiting their ...

Slide 1 of 4, Soldiers wearing gas masks during World War One, Poisonous gas was used as a weapon The First World War was the first-time poison gas was used on a large scale during war.