Sonar was not introduced in World War 1.
the first ever mass produced tank was developed and used near the end of WW1
the tank
mustard gasthe tanktrench warfare. (although begun in the American Civil War)
In World War 2 the Germans introduced the V2 rocket, a terrifying new offensive weapon. In WW1 poison gas was considered the most terrifying weapon.
broken pistolthe zeppelin was the least important weapon in ww1.
THE MACHINE GUN and THE POISONUS GAS
the first ever mass produced tank was developed and used near the end of WW1
The fighter aircraft, bomber aircraft and tank were all introduced and extensively developed in WW1
The first fighter aircraft were developed in Britain, France and Germany during WW1
Many airplanes were developed during WW1.
the tank
mustard gasthe tanktrench warfare. (although begun in the American Civil War)
many new weapons came around during the first world war so next time finish the question but the most important guns were flamethrower mounted machine guns airplanes started being used as a weapon. submarines and tanks were developed around this time although no one was fully trained in using them so there help was minimal this was the creation of trench warfare so barbwire would play a major role in the war hand grenades and poison gases
It was used as a weapon during WW1. The gas was packed into artillery shells and shot into the enemy trenches.
In World War 2 the Germans introduced the V2 rocket, a terrifying new offensive weapon. In WW1 poison gas was considered the most terrifying weapon.
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The tank. Though not wheeled, gas was also used for the first time in WWI.