WW1 had shown how very vulnerable Britain was to hostile submarines in the Atlantic, and the development of bombers had made much of Britain vulnerable. After the fall of France, the enemy was much nearer and could easily use airfields in Belgium and France. The whole coastline opposite Britain, from the Arctic Circle to the border between France and Spain was in enemy hands. Joncey
The machine gun changed warfare
Britain took place in the D-Day invasion, also known as the bloodiest invasion in the history of warfare.
World War 1
The use of chemical weapons during the first World War ; see relevant link below .
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.
The machine gun changed warfare
Nuclear weapons
First specify what you mean by 'then', as you are covering a wide timespan, during which warfare changed radically.
Iron Bridge
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Warfare changed in various ways during ancient times. For example, Roman legions revolutionized warfare through the tactics and formations they used.
Radar
Crop rotation system developed in Britain during agricultural revolution increase crop yields by increasing nutrients in the soil.
Crop rotation system developed in Britain during agricultural revolution increase crop yields by increasing nutrients in the soil.
Crop rotation system developed in Britain during agricultural revolution increase crop yields by increasing nutrients in the soil.
Britain took place in the D-Day invasion, also known as the bloodiest invasion in the history of warfare.
World War 1