WWII crossword

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Across
  1. 3. Germany's solution to trench fighting
  2. 5. Prime minister of Britain at the time
  3. 6. The first atomic bomb used in warfare
  4. 8. The president of the US at the time of WWII
  5. 9. One of the largest amphibious military assaults in history
  6. 11. First invaded place by Germany
  7. 15. The political party led by hitler
  8. 16. Split between Russia and Germany
  9. 17. Germany, Japan, and Italy's alliance
  10. 18. A technological advancement that brought the war into the air
  11. 20. Capital of Germany
Down
  1. 1. Imprisoning of Jews
  2. 2. Hitler's biggest mistake in Russia
  3. 4. When a country is overwhelmed in a war and has to _________
  4. 7. The German word for living space
  5. 10. Russia's first ally of WWII
  6. 12. Germany's main focus to exterminate
  7. 13. Letting it slide "one more time" to hopefully prevent war
  8. 14. The name of the pact between France, Britain, and the United States to fight against the axis
  9. 19. An agreement between two or more countries to help each other if they become involved in war