Kill people
Used extensively.
Yes. There were machine guns in WW1. There were Gatlin Guns, a type of machine gun, in the Civil War.Yes
rifles and machine guns
All of the major players possessed machine guns by the outbreak of the war.
unknown
it affected it by gas.
They were not yet invented- did not exist.
machine guns, submarines and poisen gas
machine guns, mustard gas, tanks
machine guns, mustard gas, tanks
All of them. Very popular weapon.
Much of the war was fought in trenches.