World War I

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Across
  1. 3. submarine
  2. 4. arms race or glorification of the military
  3. 6. country blamed by A-H for assassination
  4. 7. final set of demands
  5. 9. blimb airship
  6. 11. weapon that forced troops into trenches
  7. 12. countries that agree to protect each other
  8. 14. Britain, France, Russia & Italy
  9. 15. Germany, Austria, Ottoman Empire
Down
  1. 1. area between trenches in WWI
  2. 2. not taking sides in a war
  3. 5. when neither side is able to defeat the other
  4. 8. created rivalries among the Europeans
  5. 10. Archduke assassinated (last name)
  6. 11. to prepare troops for war
  7. 13. trade ships protected by warships