World War I

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Across
  1. 2. Assassination victim whose death sparked the war
  2. 3. Overthrow of the Tsarist government during the war
  3. 6. International organization established after the war
  4. 7. Use of poisonous gases as weapons
  5. 9. Devastating automatic weapons used in trench warfare
  6. 10. Allied operation aimed at securing the Dardanelles
  7. 12. Intercepted message that helped bring the U.S. into the war
  8. 14. Ceasefire that ended the fighting on November 11, 1918
  9. 17. Primary theater of war in France and Belgium
  10. 18. German airship attacks on British cities
  11. 19. Longest single battle of the war, fought between France and Germany
  12. 20. Costly British offensive on the Western Front
Down
  1. 1. American President who led the U.S. into the war
  2. 4. Controversial event involving a German U-boat attack on a passenger liner
  3. 5. Pre-war agreements that divided Europe into opposing camps
  4. 8. Theater of war between Russia and the Central Powers
  5. 11. of armored fighting vehicles in battle
  6. 13. Agreement that ended the war between Russia and Germany
  7. 15. Post-war agreement that imposed harsh terms on Germany
  8. 16. Type of combat characterized by stalemate and attrition