WW1 Chlorine Gas

There were three major types of gasses used during WW1: Lachrymator, Sternutator, and Suffocating gasses. This picture shows   chlorine gas, a type of sternutator gas, being lit by German soldiers during the Second Battle of Ypres. Wilfred Owen wrote about a gas being used against them during the war, and gave readers a glimpse of the effects the gas had on soldiers. 

https://www.rferl.org/a/history-of-chemical-weapons/29184063.html