World War I

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Across
  1. 4. One of the two most innovative weapons of World War I
  2. 5. Proposed the convoy system
  3. 6. Germany's method of invading Belgium
  4. 8. Nation that signed the armistice that ended the war in November 1918
  5. 9. This ship was sunk by German U-Boats in response to the British blockade
Down
  1. 1. Won the Presidential election for the U.S. in 1916
  2. 2. Led the American Expeditionary Force
  3. 3. France, Britain, and Russia
  4. 4. Often required amputation of the foot or toes from rotting
  5. 7. This person's assassination led to World War I