Across
- 4. These weapons were used by submarines (9)
- 5. This gas was first used at Ypres in 1915 (8)
- 6. Used by all soldiers in World War One(5)
- 7. This type of gun fired shells (5)
- 9. Tanks were first used at this battle (5)
- 11. A fight between two planes (8)
Down
- 1. This colorless gas is deadly(7)
- 2. Also known as Blimp (8)
- 3. This gun needed 4 - 6 men to work it (7)
- 8. This American liner was blown up (9)
- 10. Name of the first tank little ______ (6)