Causes of World War I & First Modern War

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Across
  1. 3. Competition to build the biggest military among nations
  2. 7. Mutual defense agreements that could pull many countries into a conflict
  3. 10. Countries that sided with Serbia, France, Great Britain and Belgium were know as the _________.
  4. 11. For protection from modern weapons, soldiers dug ditches that evolved into intricate systems where soldiers lived and fought. This was the beginning of __________ Warfare.
  5. 12. Also known as hand-bombs, they could kill the enemy underground and behind cover.
  6. 14. Countries that sided with Austria-Hungary and Germany were known as the ________ ______.
  7. 16. Also known as U-Boats, they could surprise enemies vessels and caused massive casualties.
Down
  1. 1. When pilots fought each other in the air with mounted machine guns, it was called a _____ ______.
  2. 2. The belief that your country is superior to other countries
  3. 4. Economic and political control over weaker nations
  4. 5. __________ Warfare involved the mass use of poisonous gases like chlorine, phosgene and mustard gas.
  5. 6. Capable of firing 500 bullets per minute
  6. 8. Countries that did not take a side or join the was were known as being _________.
  7. 9. Inspired terror, could roll over barbed-wire and provided firepower to the infantry.
  8. 13. The assassination of this leader was an immediate cause of WWI
  9. 15. Most of the fighting in WWI happened on this continent.