World War 1 (part 1)

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Across
  1. 4. the longest trench line was called the ____ front
  2. 5. this country switched sides
  3. 9. the program that required young American men to sign up for the army
  4. 12. the longest battle of the war
  5. 13. strong patriotic feelings for one's own country
  6. 15. France, Russia, and Great Britain formed the Triple ?
  7. 16. a word that means betraying your country
Down
  1. 1. the largest sea battle that only lasted 30 minutes
  2. 2. the country that the Zimmerman telegram was sent to
  3. 3. the archduke of Austria-Hungary was killed by a terrorist from this country
  4. 6. Germany, Austria-Hungary, and Italy formed the Triple ?
  5. 7. the holiday that some Germans and Allies celebrated together
  6. 8. walls made of barbed wire and sandbags
  7. 10. an explosive that was shot out of German U-boats
  8. 11. the last name of the American president during WW1
  9. 14. the name of the ship that was sunk by the Germans