They were not yet invented- did not exist.
Used extensively.
Yes. There were machine guns in WW1. There were Gatlin Guns, a type of machine gun, in the Civil War.Yes
Kill people
rifles and machine guns
There are several things that were first used in WW1 like submarines, machine guns and fighter planess. The first sub-machine gun was developed during WW1 but the war ended before in came in to service.
No
All of the major players possessed machine guns by the outbreak of the war.
it affected it by gas.
unknown
sub machine guns, pistols, launchers, light machine guns, sniper rifles,
The Thompson sub-machinegun was marketed in 1919.
machine guns, submarines and poisen gas