Daniella 7B WW1

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Across
  1. 3. wooden board to cross over trench
  2. 6. painful condition of the feet
  3. 8. German submarines
  4. 9. poisoness gas
  5. 12. war in trench
  6. 14. Area between opposing armies and trench line
  7. 15. big car weapons
Down
  1. 1. underwater boats
  2. 2. dug in ditch
  3. 4. groups of merchant ships
  4. 5. large caliber guns
  5. 7. English channel to Switzerland
  6. 10. carries bombs and drops bombs
  7. 11. guns that shoot many bullets at a time
  8. 13. aircraft