WWI Crossword Puzzle

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Across
  1. 1. stealth in water
  2. 3. dug for war in zigzag formation
  3. 5. the reason war started
  4. 6. assassinated Archduke
  5. 9. sunk by submarine
  6. 10. terrifying short ranged weapons
  7. 11. Austria-Hungary declared war and started WW1
  8. 12. protects you from deadly air
  9. 14. introduced by the british changed the way we fight
Down
  1. 2. 600-700 rounds a minute
  2. 4. poisoned air mustard color introduced by Germany
  3. 7. land between trenches with holes and landmines
  4. 8. canned food for soldiers
  5. 13. sent supplies to the allies