Chemical weapons in World War I were primarily used to demoralize, injure and kill entrenched defenders, against whom the indiscriminate and generally slow-moving or static nature of gas clouds would be most effective. The types of weapons employed ranged from disabling chemicals, such as tear gas and the severe mustard gas, to lethal agents like phosgene and chlorine. This chemical warfare was a major component of the first global war and first total war of the 20th century. The killing capacity of gas, however, was limited – only four percent of combat deaths were caused by gas. Because it was possible to develop effective countermeasures against chemical attacks, such as gas masks, gas was unlike most other weapons of the period. In the later stages of the war, as the use of gas increased, its overall effectiveness diminished. The widespread use of these agents of chemical warfare, and wartime advances in the composition of high explosives, gave rise to an occasionally expressed view of World War I as "the chemists' war".
Read more about Chemical Weapons In World War I: Casualties, Countermeasures, Delivery Systems, Unexploded Weapons, Gases Used, Effect On World War II
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