world war 1 crossword puzzle

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Across
  1. 4. the treaty that end World War 1?
  2. 7. It slowed down the war
  3. 8. the meeting to end World War 1
  4. 9. was a type of gas used in the war
  5. 10. It villainized the enemy and was used to spread nationalism
  6. 13. this is where the trench warfare was made
  7. 14. they were guns used in the war
  8. 15. were used in the skies of world war 1
Down
  1. 1. organization did Wilson propose to achieve
  2. 2. this holiday is celebrated on November 11
  3. 3. this is where most movement happened and bigger wars
  4. 5. was signed between Germany and the Allied Powers to end the fighting.
  5. 6. did not sign this treaty
  6. 11. the leader of the central power
  7. 12. the leaders of the Allies