Sonar was not introduced in World War 1.
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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.