The Germans used it first on April 22, 1915 by opening 168 tons of chlorine gas. This gas was heavier than air which meant it stayed near the ground and anyone who would breathe is suffocated immediately (Wikipedia). Another type was mustard gas and this was the most deadly kind because gas masks could not stop it. It penetrated the clothing and burned the skin. During the whole war, gas killed more than 700,000 troops on both sides. Eventually, they stopped the use of gas in 1925 and it was not used in World War II because Hitler got temporarily blinded by it
The Germans used it first on April 22, 1915 by opening 168 tons of chlorine gas. This gas was heavier than air which meant it stayed near the ground and anyone who would breathe is suffocated immediately (Wikipedia). Another type was mustard gas and this was the most deadly kind because gas masks could not stop it. It penetrated the clothing and burned the skin. During the whole war, gas killed more than 700,000 troops on both sides. Eventually, they stopped the use of gas in 1925 and it was not used in World War II because Hitler got temporarily blinded by it