chemical weapon: Quick Facts

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American soldiers in World War I uniforms, some wearing gas masks, advance with rifles during a simulated gas attack exercise on a rocky battlefield.

Gas masks at the Second Battle of Ypres

Two German soldiers wearing helmets and gas masks operate a machine gun during World War I.

Mustard gas in World War I

A protester stands in the street with arms raised, facing a cloud of tear gas and a line of police during nighttime unrest in Baltimore, with orange smoke filling the scene.

U.S. wartime use of defoliant in Vietnam

Two American soldiers in World War I uniforms use large paddles called gas flappers to fan poison gas inside a dirt trench.

Person in chemical protective gear and mask attends to a mock patient on a stretcher inside a yellow portable decontamination chamber during a hazardous material team drill.

French soldiers in uniform show a group of women how to put on gas masks outside a wooden shelter in a village near the front in Alsace during World War I.

The horrifying history of gas warfare

Observe English schoolchildren practicing using gas masks in case of a chemical attack amid World War II

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