The use of poison gases—ranging from disabling chemicals like tear gas and mustard gas to lethal agents like phosgene—was a military innovation put into use during WWI that had a major impact on warfare. Although the killing capacity of gas was limited—only 4% of combat deaths were due to gas—the proportion of non-fatal casualties was high, and gas remained one of the soldiers’ greatest fears. What were some of the early, crude countermeasures developed to defend against the use of poison gases? Discuss
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