THE MACHINE GUN and THE POISONUS GAS
It was used as a weapon during WW1. The gas was packed into artillery shells and shot into the enemy trenches.
Sonar was not introduced in World War 1.
The tank. Though not wheeled, gas was also used for the first time in WWI.
broken pistolthe zeppelin was the least important weapon in ww1.
All of them. Very popular weapon.
Yes. In vapor form it can displace oxygen and that's why it was used in WW1 as a weapon.
mustard gasthe tanktrench warfare. (although begun in the American Civil War)
the tank
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.
Two military advances first used during WW1 were weapons and tactics.
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They were easier to carry. They were only used as a second firearm and never a primary weapon. It is their last line of defence.