Poisonous gas, was first used by the Germans in the second battle of Ypres in April of 1915. It killed many French soldiers in its time of use. At first the French Soldiers did not know what it was, and they thought it was a smoke screen so they did not worry too much about it, but they suffered not long after. It caused chest pain and later on a burning sense in your throat, and you will eventually suffocate to death.
The machine