22 avr. 1915 - Chemical weapon

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The first full-scale deployment of deadly chemical warfare agents during World War I was at the Second Battle of Ypres, on April 22, 1915, when the Germans attacked French, Canadian and Algerian troops with chlorine gas.

https://images.theweek.com/sites/default/files/styles/tw_image_9_4/public/52231_article_full.jpg?itok=PD3vIjV6&resize=1260x560

https://winstonchurchill.hillsdale.edu/wp-content/uploads/2015/10/Churchill-and-Chemical-Warfare-840x430.jpg

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