chemical warfare
noun
: tactical warfare using substances (such as incendiary mixtures, smoke, or gases) with irritant, burning, poisonous, or asphyxiating properties
There were other isolated instances of chemical warfare. The Greeks used a gas attack with sulphur fumes at the siege of Delium in 424 B.C.—Bernard and Fawn M. Brodie
The forswearing of chemical warfare by the major combatants in World War II foreshadowed the later nuclear "balance of terror," during the Cold War.—Clifford F. Beal
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Merriam-Webster unabridged
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