David Puzzle

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Across
  1. 6. Armored vehicles first used extensively in World War I
  2. 8. International organization created to promote peace
  3. 9. Severe worldwide economic downturn beginning in 1929
  4. 11. Agreement to stop fighting
  5. 13. Political system associated with Mussolini's Italy
  6. 14. Policy of gaining colonies and foreign territories
  7. 15. German strategy for fighting a two-front war
  8. 18. Information used to influence public opinion during war
  9. 19. Long World War I battle fought mainly by British forces
  10. 20. Major World War I battle with massive casualties
Down
  1. 1. Underwater vessels used to attack ships
  2. 2. Treaty that officially ended the war with Germany
  3. 3. Strong pride in one's nation that can lead to rivalry
  4. 4. Fighting from long defensive ditches
  5. 5. Agreements between nations for mutual support
  6. 7. Radical Russian group led by Lenin
  7. 10. Chinese Nationalist Party led by Chiang Kai-shek
  8. 12. Building large armed forces and glorifying military power
  9. 16. Planned destruction of an entire people group
  10. 17. Political party led by Hitler in Germany