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Across
  1. 1. Bugs that infested peoples hair
  2. 3. The assassination of this man started WWI
  3. 4. A sport they played during Christmas
  4. 6. Rodents that infested trenches
  5. 7. High artillery vehicles were developed in WWI
  6. 10. They had really strong friendships
  7. 11. Rounds of ammunition shot from a gun barrel
  8. 12. Holes in the ground that they fought in
Down
  1. 2. Where the world war occurred
  2. 3. The original
  3. 5. The troops stopped to celebrate this holiday
  4. 8. Upgrades of weapons and discoveries
  5. 9. A lot of people got shot
  6. 11. They had nothing to do