Poison Gas

Poison Gas (Chlorine) was first used in the Second Battle of Ypres, by the Germans. Although the French were the first to use it, trying to prevent them from invading Belgium, it was only tear gas, an irritant, not intended to kill. When the Germans used it against the French forces, they thought it was a smokescreen and lined up all their men in the front for a big attack. As soon as they realized it was poison gas they fled in terror.