Open field warfare the land where two sides meet for war and fight.
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Most dramatically, WWI changed the nature of warfare from armies marching in an open field and facing each other in formations, commonly known as "maneuver warfare", to trench warfare. It was also the beginning of Mechanized Warfare, seeing the introduction of tanks, gas, cars, the Maxim machine gun, and other new weapons.You ask a very complex question... this is just the gist of the answer.
1957
Because this naval battle (incident) was responsible for open warfare between the US and North Vietnam.
Biological warfare.
trench warfare