Weapons of WWI

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