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A number of poison gasses were used in WW1. The first use is by the Germany at the battle of Second battle of Ypres. But, by 1915 the French managed and even more powerful gas called Phosgene. Phosgene took 24 hours to manifest itself, chlorine had a greenish cloud and a very strong ouder. But the most effective chemical weapon was mustard gas which, despite ...


As noted in another answer, the Germans introduced chlorine gas early in 1915, the French countered with phosgene gas later in the year, and the Germans "topped" this with mustard gas in 1917. Gas was used mainly for shock value. The German apparently gained an advantage with "first use" in the Second Battle of Ypres. But gas is hard to store and transport, ...

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