World War I

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Across
  1. 3. first name of archduke who was assassinated
  2. 5. This country got put with the blame for WWI
  3. 7. This type of weapon was used in WWI
  4. 10. one of the causes of WWI
  5. 12. This type of warfare was used in WWI
  6. 15. Country that issued ultimatum
  7. 16. The name of the area between trenches
  8. 18. This empire was dissolved at the end of the war
  9. 19. This country had to leave in 1917
Down
  1. 1. Country who refused to answer ultimatum
  2. 2. This neutral country was invaded by Germany
  3. 4. Country that fought on the western front
  4. 6. This plan was designed to avoid fighting on two fronts
  5. 8. Holiday where there was a temporary truce
  6. 9. Prompted US entry in WWI
  7. 11. This caused all of the world to be involved in WWI
  8. 13. this president involved the US in WWI
  9. 14. Country that fought on the western front
  10. 17. this country tried to stay isolated