WW1 was the first occasion where poison gas was used as a weapon. How did they use it?
The French were the first to use gas. The Germans first used deadly gases. The Germans also the first to use mustard gas. Russia leaded in most gas casualties and deaths in war. Only 4% of deaths in the war were caused by gas. Mustard gas gave rashes to the inside and outside of the body. To protect themselves they used gas masks and heavy clothing. They had gas masks for their pets and even horses.