In World War I, what is considered to be the first modern war, familiar weapons such as cannons and rifles were remodeled and more dangerous. Out of them all, the weapon that caused the most death was the artillery. Automatic rifles and machine guns gave soldiers less time reloading and more time shooting. Poisonous gases such as chlorine and mustard gas were new things these soldiers had to look out for. It was the first use of chemical weapons. Tanks were also a new weapon that men in the trenches of both sides feared. The battle introduced a new feature in World War I—underwater operations. German forces used U-boats that had torpedoes and guns to sink allied ships with. Weapons in the air, on the ground, and underwater took the lives of
