World War I Crossword Puzzle

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Across
  1. 4. Germans used this boat to sink Allied ships
  2. 6. Fight over who had the strongest military, and thus who was the strongest country
  3. 8. A ship that carried important equipment, goods, and troops during the war
  4. 11. Secret treaties of mutual defense and military support between European powers
  5. 12. A toxic gas used mainly by German soldiers attacked the lungs and caused uncontrollable coughing
  6. 13. The United States did this for most of WWI
Down
  1. 1. Archduke of Austria Hungary
  2. 2. Secret alliance between Germany, Austria-Hungary, and Turkey at the start of WWI
  3. 3. Where empires expanded their borders, powers, and resources by taking over new territories
  4. 5. Where leaders of the Ottoman Empire killed hundreds of thousands of Armenians
  5. 7. Acronym that describes what caused WWI
  6. 9. Secret alliance between France, Britain, and Russia at the start of WWI
  7. 10. An armored vehicle that could capture land more effectively than foot soldiers
  8. 11. Serbians did this to the Archduke of Austria Hungary