I'm sure there are hundreds of different opinions on the effectiveness of the M1 carbine. My father was in 4 campaigns of the European theatre and he would not carry the M1A1 carbine issued to him because of the lack of stopping power. He either used the M1 rifle or Thompson SMG. Mostly the Thompson.
The marines used many gun models throughout the war. However, the primary weapon of US forces was the M-1 Garand. The M1 Carbine and M14 were also frequently used rifles.
M1 Carbine
There can be no doubt that the most deadliest weapon of world war 2 was the nuclear bombs that dropped on Hiroshima.
morrison shelters
The submarine.
The most common one that was used as a weapon in World War 1 is called the Artillery
4m1 garand, m1 carbine
Man.
guns
The most common method was with artillery.It is NOT a biological weapon, it is a chemical weapon.
broken pistolthe zeppelin was the least important weapon in ww1.
hydrogen bomb