World War I

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Across
  1. 2. fired hundreds of rounds per minute
  2. 4. extreme form of patriotism
  3. 7. telegram from Germany to Mexico
  4. 12. alliance of Germany and Austria Hungary
  5. 14. armored fighting vehicles
  6. 15. group of countries to maintain peace
  7. 18. union formed for mutual benefit
  8. 19. Germany's plan to defeat France
  9. 20. underground group in Serbia
Down
  1. 1. treaty that ended WWI
  2. 3. area between two trenches
  3. 5. coming out of your trench to attack
  4. 6. one country taking control of another
  5. 8. british passenger ship sunk by Germany
  6. 9. alliance of France, Russia, United Kingdom
  7. 10. type of warfare used in WWI
  8. 11. glorification of armed strength
  9. 13. silent killer in the trenches
  10. 16. long range version of canons
  11. 17. archduke of Austria Hungary