関連ワード:
what tanks were first used in ww1 what were tanks primarily used in ww1 what battle were tanks first used in ww1 what year were tanks first used in ww1 what happens when tanks were first used in ww1 what battle was the tank first used in ww1 what was the first tank used in ww1 what were tanks primarily used for in wwi what happened when the tanks were first used in battle ww1 what was the first tank ever used in ww1
