Causes of the First World War

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Across
  1. 3. Competition between two countries. (7)
  2. 6. Underwater boat (9)
  3. 8. Vehicle invented in WW1 (4)
  4. 9. Country in Asia, allied to Britain (5)
  5. 10. The Alliance including Russia and France (6,7)
  6. 12. Wilfred ____ (poet)(4)
  7. 13. Weapon used by most soldiers in the war (5)
  8. 15. An Arch-Duke was murdered here. (8)
  9. 16. Better battleship (11)
Down
  1. 1. Country invaded by Germany (7)
  2. 2. Agreement between two countries (8)
  3. 4. Country that rules many others (6)
  4. 5. Country in the Balkans (6)
  5. 7. Capital of France (5)
  6. 10. Soldiers lived in these. (6)
  7. 11. Neutral country, with Vikings. (6)
  8. 14. _________ Ferdinand (5)