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Submarines.
Submarines fought in both WW1 and WW2.
Underseaboats.
Yes, many submarines were used in WW1 by most of the major combatants.
you could easily defend your trench with a small number of men, against a larger number of attackers
No there were no tanks planes OR submarines in ww1. My friend Dennis ate them all.
machine guns, submarines and poisen gas
Most definitely! AE2 was the First ANZAC!
"Guerre de Course", Merchant Ship sinking.
submarines were used in WW1 and the weapons used were torpedos and a deck gun.
Britain, France, Germany, Italy and USA all used submarines during WW1
Poison GasAirplanes Submarines Tanks Automatic machine guns