Answer:
Hope this helps
Step-by-step explanation:
The machine gun completly changed warfare. The first machine gun was invented in 1884 by Hiriam Maxim, He called it the Maxim gun after him. But you may be saying what about the gatling Maxim created the first fully auto machine gun. How it changed the war 1 machine gunner could take down a whole squad effictively become a trench monster. while barbed wire Changed trench warfare when they put barbed wire out you cant just run through it. so it slowed the process of pushing the enemy.