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Machine guns made their debut in WWI. During that war, they forced a change to trench warfare. In later wars, they helped change armies' tactics, moving the armies away from massed formations and into looser battle orders.
Before and during WWI, military commanders thought that battles were won by massed charges of men. This had been fairly effective in the past because there were no rapid fire weapons. But then machine guns were invented, giving tremendous rates of fire and longer ranges than rifles had. This made mass charges suicidal. Sadly, commanders in WWI kept trying them, even after they moved to trench warfare.
In WWII, for example, commanders learned from WWI and no longer committed troops to mass charges. Tactics centered around things like staggered rushes by small groups of men under covering fire from those behind them. Infantry stopped massing and charging and started to be more dispersed to avoid giving the machine guns huge targets to simply mow down.
It helped many countries fight threw war. It gave the people using them a good advantage in attacking and defending. It made the war much easier to be fought.
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