World War I. Revision

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Across
  1. 3. The end of WWI. is seen as the first step towards...
  2. 6. The country that entered the war in 1917
  3. 7. One of the real reasons for the outbreak of WWI.
  4. 8. The country the central powers tried to invade first
  5. 9. The Austro-Hungarian heir's title
  6. 10. The country that promised to support Serbia against Austria
  7. 12. The place where the most famous and longest battle of WWI. took place
  8. 15. The place where the peace treaty was signed on 28 June 1919 and also its name giver
Down
  1. 1. This is where soldiers spent a lot of time during WWI.
  2. 2. The heir of the Austro-Hungarian throne
  3. 4. The crime that was committed on 28 June 1914
  4. 5. The place where a crime was committed on 28 June 1914
  5. 11. The country that offered its help against Serbia
  6. 13. The name of the "Allied Powers"
  7. 14. There were two of them: the Eastern and the Western