World War 1 (The Great War)

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Across
  1. 3. Name of the German leader during WW1
  2. 5. Name of the Alliance member who switched sides during the war
  3. 7. New weapon introduced in WW1 and replaced Horseback
  4. 9. Name of the gas used in this war (first used in 1915)
  5. 11. This front was where the most trench warfare occured
  6. 12. Treaty used to end the war officially
  7. 15. The assassination of this Archduke sparked WWI
Down
  1. 1. Alliance between Germany, Austria-Hungary and Italy
  2. 2. Alliance between Great Britain, France and Russia
  3. 4. Name of the US Leader during WW1
  4. 6. Name coined to German submarines
  5. 8. Area between enemy trenches
  6. 10. Battle which lasted over 300 days
  7. 13. Name of the ship sunk by German U-Boat in 1915
  8. 14. Name WW1 was given prior to WW2