World War One

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Across
  1. 6. Agreements between nations for mutual defense
  2. 7. Belgium's stance at the start of WWI
  3. 9. Type of warfare Germany used to sink Allied ships
  4. 10. Location of a major naval battle in WWI
  5. 11. The assassin of Archduke
Down
  1. 1. Powerful warships used by Germany and Britain
  2. 2. To prepare troops for war
  3. 3. Policy Aggressive military buildup
  4. 4. Assassinated Archduke
  5. 5. Germany's promise to Austria
  6. 8. Underwater explosives used to blockade ports