World War 1 Crossword!

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Across
  1. 2. armored vehicle with treads first introduced during World War 1
  2. 4. long ditches used as the basis of warfare for world war 1
  3. 9. when countries extend their powers and Influence onto other lands
  4. 11. a heavier and fast shooting gun
  5. 13. american president during world war 1
  6. 15. Location of the first battle of World War 1
Down
  1. 1. archduke of Austria Hungary
  2. 3. fighter pilots who shoot down 5 planes
  3. 5. devotion to the interests and culture of One's nations
  4. 6. conflict between nations or a peole
  5. 7. name for leader Wilhelm II of the German Empire
  6. 8. british ship that brought american Involvement into World War 1
  7. 10. name of american troops in Europe
  8. 12. name of the german submarine
  9. 14. destroyers escorting merchant ships to protect from U-boats