History vocab

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Across
  1. 3. A policy to maintain a large military ready for war
  2. 4. Disputed area in-between the trenches
  3. 6. Agreement to aid each other if attacked
  4. 8. German submarines would blow up any enemy ships
  5. 10. Competition for colonies
  6. 11. Was assassinated by Gavrilo Princip
  7. 14. Extreme patriotic feelings that one country is better
  8. 15. were first used for observation on opposing sides
  9. 16. Invented by Germany, not easy to use
  10. 17. Airplanes fighting each other in the air
Down
  1. 1. Became more deadly as the war went on
  2. 2. The leader of Germany
  3. 5. The military alliances that fought against central powers
  4. 7. Used to get over the barbed wire in No Man's Land
  5. 9. A type of combat in which the opposing sides attack
  6. 12. Assassinated Archduke Franz Ferdinand
  7. 13. The military alliances that fought against the allied powers