WWII crisscross puzzle

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Across
  1. 3. a German submarine
  2. 4. german air force
  3. 6. prime minister during WWII
  4. 9. leader of Nazis
  5. 11. people who carried out Hitler way to cleanse Germany of threats
  6. 12. worked by sending radio waves and receiving the waves bounce back of objects surrounding
  7. 14. attack on US Navy's base located on oahu hawaii
  8. 15. names of france after hilter took over
Down
  1. 1. the time WWII occurred
  2. 2. when a country starts preparing for war grabbing supplies and people
  3. 5. first atomic bombing attack during WW2 accrued here
  4. 7. great Britain,united states,soviet union
  5. 8. suprise attack to overwhelm and tire out opposing defenses
  6. 10. Germany, Italy, Japan
  7. 13. day of important operations and military attacks