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