World War I Crossword Puzzle

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Across
  1. 9. World War I became a ______ involving a complete mobilization of resources and people.
  2. 11. These appeared for the first time on the battlefield in 1915.
  3. 13. a war based on wearing the other side down
  4. 15. heir to the Hapsburg throne
  5. 16. a place southwest of Constantinople
  6. 17. a military draft
  7. 18. France, Great Britain, and Russai created this in 1907.
  8. 20. In 1914, this made a large Slavic state in the Balkans
Down
  1. 1. German giant airship
  2. 2. systems directed by government agencies
  3. 3. promised Germany's full support with a blank check
  4. 4. process of assembling troops and supplies
  5. 5. Germany, Austria-Hungary, and Italy formed this in 1882.
  6. 6. ordered partial mobilization of the Russian army
  7. 7. Sarajevo is a city in _____.
  8. 8. fighting from ditches protected by barbed wire
  9. 10. a 19-year-old Bosnian Serb
  10. 12. American president who said everybody is a part of the army
  11. 14. Who halted a short distance from Paris at the first battle of Marne?
  12. 19. ideas spread to influence public opinion