Poison gas was first used by the Germans. Its purpose was to asphyxiate enemies and usually caused extremely painful death.
Tanks were created as a response to trench warfare. They are armoured vehicles that can travel on all terrain and
Although they were heavy, required four to six men to operate, and often jammed or overheated, machine guns were estimated to have the effectiveness of eighty rifles. This is because they csn fire off many rounds nonstop.
Submarines were used to fire torpedoes at ships from under the water.