well it wasn't discovered it was created and "it" is "they" there were many different types of gasses and the french first used tear gas Germans used Phosgene, chlorine, and mustard gas in the battles of Ypres I hope this helps u
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The Germans used the deadly poison Mustard Gas in World War I. The British used something equivalent to this, but not exactly the same.
tear gas
Poison gas was used for the first time.
poison gas was used for the first time. APEX
The nazi's did not use poison gas that was the German Republic or Weimar Republic during world war one nazi's were a political "group" [party] made by peopl who for all we know they could've been best friends with himlar nazi's were behind world war two