Afterwards, Allied forces discovered that urine-soaked cotton pads neutralised the chlorine. However, they found it difficult to fight like this!!
Mustard gas was the most deadly biological weapon that was used in the trenches. It was odourless and took 12 hours to take effect! It was also very powerful, only small amounts needed to be added to shells to be effective and it remained active for several weeks when it landed in the soil!


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