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- Various gases caused choking, blinding, or severe skin blisters
- Gas masks protected soldiers from Gas
- Gas was sent by missile into trenches, killing or disabling troops
- One or two seat propeller plane equipped with machines gun
- At first mainly used for observation
- Later, individual combat used planes
- Mounted gun that fires rapidly
- Made it possible for few gunners to mow down waves of soldiers
- Created a stalemate by making it difficult to advance through no man’s land
- Armored vehicle that travels on a track allowing it to cross many types of land
- Protected advancing troops as they broke through enemy lines
- Early tanks were not often used because they were slow and clumsy
- Underwater ship that can launch torpedoes, or guided underwater bombs
- Used by Germans to destroy Allied shipping
- U-boat attacks helped bring US into war