Poppy and Kerrigan's WW1 crossword

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Across
  1. 3. a person who serves in the army
  2. 5. underwater boat
  3. 6. a narrow ditch that was dug by soldiers
  4. 10. a rodent that examples as a large mouse
  5. 12. fire gun
  6. 13. a Sargent dog
  7. 14. pitch black
Down
  1. 1. underground bombs
  2. 2. countries making promises to protect other countries
  3. 4. sickness
  4. 7. a small bomb thrown or launched by hand
  5. 8. a automatic gun that fires bullets at rapid speed
  6. 9. a powered flying vehicle
  7. 11. a substance that is capable of death