The first machine gun was the gatling gun, invented in 1861 There were a variety of multi barrelled guns invented prior to this, but they are not considered to be machine guns.
It wasn't soldiers who invented machine guns.
1884 for machine guns.
They were mainly invented for world war I in 1914
They were not yet invented- did not exist.
Machine guns weren't invented during WW1. They existed decades before the war.
The Thompson sub-machinegun was marketed in 1919.
Chlorine gas, machine guns, tanks, and planes were used for war.
1883, with the first prototype demonstrated in 1884.
No. Machine guns will beat Gatling guns.