New inventions changed warfare during World War 1 by creating new weapons and creating more casualties. Some of the inventions during World War 1 were tanks, infantry rifles, and machine guns.
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because they were very advanced and had great power compared to the old weapons.
Militarily, WWI saw the introduction of tanks and airplanes into warfare. This rendered the tactics of "trench warfare" obsolete in later wars, as the practice produced a catastrophic number of human casualties during WWI.
World War 1 introduced aerial warfare with airplanes and trench warfare
In general, the same as in other wars of that era. Specifically, there was a great deal of trench-warfare. Chemical weapons were used. There were new inventions such as the tank and the fighter plane.
The machine gun changed warfare
trench warfare