WW1 Crossword Puzzle

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Across
  1. 3. the dangerous part of land between the trenches
  2. 4. countries promising to help other countries
  3. 7. army fighting where both sides build long deep tunnels
  4. 8. a warship designed to operate while submerged underwater
  5. 9. expanding territory
  6. 12. excessive pride in your country
  7. 13. formally ended WW1
  8. 14. a gun like weapon that sprays fire
Down
  1. 1. a weapon that can fire multiple rounds of rapid succession
  2. 2. coiled and sharp steel fencing used to slow enemies down
  3. 5. a message sent by telegraph
  4. 6. the first worldwide intergovernmental organization
  5. 10. problems being solved with military strength
  6. 11. president during WW1