Machine Guns: Machine guns were already in use before World War I, but they were used on a much larger scale during the war. They were able to fire hundreds of rounds per minute, making them devastatingly effective against infantry.
Airplanes: Airplanes were first used for reconnaissance during World War I, but they were soon adapted for use in combat. Fighter planes were used to shoot down enemy aircraft, while bombers were used to attack ground targets.
Submarines: Submarines were used by both sides during World War I. They were able to sink enemy ships and disrupt enemy supply lines.
Chemical Weapons: Chemical weapons were first used by the Germans during the Battle of Ypres in 1915. They caused severe burns and respiratory problems, and they could be fatal.
Wireless Communication: Wireless communication was used by both sides during World War I. It allowed troops to communicate with each other over long distances, which was essential for coordinating attacks and movements.
Medical Advancements: World War I saw a number of medical advancements, including the development of new surgical techniques, the use of blood transfusions, and the development of new vaccines. These advancements saved the lives of many soldiers and helped to reduce the death toll from disease.