The document summarizes several new weapons introduced during World War 1, including tanks, poison gas, and flamethrowers. It describes that the tank was developed by Ernest Swinton and Winston Churchill, weighed 14 tons and could travel over 3 mph. Poison gas such as mustard gas caused burning throats and lungs but gas masks were later developed. Flamethrowers were used to clear trenches but were difficult to maneuver and only operated for 40 seconds at a time.