Stelting World War I Puzzle

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Across
  1. 3. Prolonged the war
  2. 5. countries who were not ____ would not win the war
  3. 9. ship sunk by german u-boats
  4. 10. clear holes in razor wire
  5. 11. the last straw to put the US into the war
  6. 12. location of western front of the war
  7. 13. used to cancel out British navy
  8. 14. left the war in 1917
  9. 17. idea to shape peace after the war
  10. 18. Splitting up the middle east
Down
  1. 1. completely destroyed by allies
  2. 2. gave advantages to defenders
  3. 4. would be used to bombard enemy 24/7
  4. 6. worst pandemic in world history
  5. 7. Entered the war in 1917
  6. 8. blamed for World War I
  7. 15. used to scout enemy position
  8. 16. stepped up as nurses and worked in factories back home