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![MilHistNow Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::576675214.png) Military History Now [@MilHistNow](/creator/twitter/MilHistNow) on x 194.9K followers
Created: 2025-07-12 04:49:00 UTC

Today in 1917, a horrifying new chemical weapon is released on the Western Front at Ypres. A blistering agent known as 'bis (2-chloroethyl) sulfide,' it gives off a scent similar to horseradish. Soldiers will call it by another name: 'Mustard Gas' 
See

![](https://pbs.twimg.com/media/GvLpDZHXsAAj8Ws.jpg)

XXXXXX engagements

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