World War One (2)

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Across
  1. 6. His assassination sparked the war in 1914
  2. 8. Peace treaty that officially ended WWI in 1919
  3. 12. Armoured vehicles first introduced in WWI
  4. 15. The German emperor during World War I
  5. 19. When entire societies mobilise all resources for war
  6. 22. Alliance of Britain, France, and Russia
  7. 23. The deadly area between opposing trench lines
  8. 26. A chemical weapon that caused blisters and blindness
  9. 28. British passenger ship sunk by a German U-boat in 1915
  10. 29. Region of conflict between Germany/Austria and Russia
  11. 30. U.S. plan for peace proposed at the end of the war
Down
  1. 1. International organisation formed after WWI to promote peace
  2. 2. Main theatre of war in Belgium and northern France
  3. 3. Nickname for American soldiers in WWI
  4. 4. U.S. president who led America into the war in 1917
  5. 5. Defensive wire used to protect trenches
  6. 7. Forcing citizens to serve in the military
  7. 9. Site of a major Allied offensive with huge casualties in 1916
  8. 10. Aerial battle between fighter planes
  9. 11. German submarine used to disrupt Allied shipping
  10. 13. Secret German proposal to Mexico intercepted by the Allies
  11. 14. Used by governments to shape public opinion and boost morale
  12. 16. Alliance of Germany, Austria-Hungary, and the Ottoman Empire
  13. 17. Agreement that ended the fighting on 11 November 1918
  14. 18. Psychological trauma experienced by soldiers
  15. 20. Famous German flying ace Manfred von Richthofen
  16. 21. One of the longest and bloodiest battles of the war, fought in 1916
  17. 24. Weapon that changed battlefield tactics with rapid fire
  18. 25. Deep ditches used for protection and combat on the front lines
  19. 27. Limiting food and supplies to support the war effort