World War I

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Across
  1. 3. Enthusiastic supporter of the nation's rights
  2. 5. An army is multiple of these
  3. 9. Murder an important person
  4. 11. Line of dugouts
  5. 14. Big projectile launchers with shells
  6. 15. Heir to leader of Austria-Hungary
  7. 17. Forced to go to war
  8. 18. Great Britain, Russia and France
  9. 19. Cause of moon craters from big guns
Down
  1. 1. Preparing soldiers to fight
  2. 2. Foremost line an army has reached
  3. 4. Taking other lands for resources
  4. 6. Peninsula of Turkey in Europe
  5. 7. Acronym of partition heading to Gallipoli
  6. 8. Multiple votes on constitution
  7. 9. Germany, Austria-Hungary and Italy
  8. 10. Putting priority on one's army
  9. 12. Site of salient in Flanders Field
  10. 13. Sign up
  11. 16. Water containers or guns on wheels