In all, more than 500,000 tons of chemical gas agents were used in World War I. Some 500,000 troops were injured and some 30,000 died, including 2,000 American troops.

History Detectives travels to Louisiana, Maryland and Pennsylvania to learn more about this important conflict and shed light on the origins of gas warfare.

For more information regarding the use of poison gas during the First World War, click here to be taken to Wikipedia. wwi_102 Tommies (British soldiers) who have been gassed change out of their ...

Battlefield reports from World War I said soldiers exposed to chloropicrin often had to remove their gas masks to vomit. The compound, "when fired in a high concentration in a specific area ...

On April 22 1915, a greenish fog drifted over the battlefield north of Ypres in Belgium, choking to death some 5,000 French soldiers and heralding a new type of ...

In 1993, tear gas was classified as a chemical weapon and in 1997 it was banned from use in international warfare. Yet US police continue to use it, legally, against civilians. "It's very uncommon ...

World War I historian Alexander Watson rates six First ... He also comments on aerial combat and gas masks in "The Red Baron" (2008) and "The Lost City of Z" (2016), starring Charlie Hunnam.

History Detectives travels to Louisiana, Maryland and Pennsylvania to learn more about this important conflict and shed light on the origins of gas warfare.