Answer:
During World War 1, a number of new weapons were introduced that had a significant impact on the course and conduct of the war. These included:
1) Machine guns: Prior to World War 1, machine guns were heavy and cumbersome, and required multiple operators to use effectively. However, advances in technology during the war led to the development of lighter, more portable machine guns that could be carried and operated by a single soldier. These weapons were highly effective at mowing down enemy soldiers and were used extensively on the battlefield.
2) Poison gas: For centuries, various forms of poison gas had been used in warfare, but these were typically unreliable and ineffective. During World War 1, however, the use of poison gas became more widespread and deadly. The most common form of poison gas used during the war was chlorine, which was released from canisters and created a deadly cloud that could suffocate enemy soldiers.
3) Tanks: Tanks had been developed prior to World War 1, but they were not widely used until the war. These armored vehicles were heavily armed and could cross rough terrain, making them useful for breaking through enemy lines and supporting infantry attacks.
4) Airplanes: Airplanes were also used extensively during World War 1, both for reconnaissance and for bombing enemy targets. Advances in aviation technology during the war led to the development of more powerful engines, stronger airframes, and more effective weapons, making airplanes a crucial part of the war effort.
Overall, the development and use of these new weapons greatly increased the destructiveness of World War 1 and had a profound impact on the outcome of the conflict.