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.
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 ...
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