Across
- 3. Used by all soldiers in World War One
- 5. This colorless gas is deadly
- 7. These weapons were used by submarines
- 8. This American liner was blown up
- 9. Tanks were first used at this battle
- 11. is also known as Blimp
- 13. fight between two planes
Down
- 1. needed 12 men to aim, load and fire
- 2. large metal-armored battleships
- 4. This gas was first used at Ypres in 1915
- 6. the area between trenches
- 10. gun needed 4 - 6 men to work it
- 12. Name of the first tank little ______