they manly used m 16 and samurai swords but then came a new weopen which was the assault rifle
The tank.
Mustard Gas was introduced into warfare in September of 1917.
Sonar was not introduced in World War 1.
How can a weapon NOT BE a weapon? Chemical gas attacks, various "automatic" weapons, machine /gatlin guns etc. The biggest weapon. not a weapon in the sense of a single person activating it was the introduction, by the British, of the tank.
The French army used it first not as a weapon but as a deterrent. it is similar to modern day tear gas.
They were introduced in 1916.
The submarine.
Man.
World War 1 introduced aerial warfare with airplanes and trench warfare
Poison Gas.
sonar
The most common one that was used as a weapon in World War 1 is called the Artillery