World War I.

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Across
  1. 7. Franz Ferdinand's title
  2. 9. The murder of Franz Ferdinand is also called a
  3. 10. This country put up a lot of resistance against German troops
  4. 11. The place where Franz Ferdinand was killed.
  5. 12. This country supported Austria
Down
  1. 1. They were forced to work in factories and on farms.
  2. 2. This country funded Russia
  3. 3. Franz Ferdinand was heir to this country
  4. 4. The exact number will never been known
  5. 5. This country supported Serbia
  6. 6. This is what Germany wanted most.
  7. 8. An invention that changed wars in general