WW2 puzzle

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Across
  1. 4. Area of Czechoslovakia that Germany invaded
  2. 5. Genocide of European Jews by Germany during WW2
  3. 6. Integration of the Austrian army into the German army
  4. 8. Group created to ensure freedom and security to all nations involved
  5. 10. Giving in to avoid conflict
  6. 12. Lightning war
Down
  1. 1. Work camps that Jews and POW's were kept in
  2. 2. Doctrine that stated that the USA can supply nations threatened by soviet forces
  3. 3. Act that stated that the USA can supply nations for the the defense of the USA
  4. 7. Japanese suicide pilot
  5. 9. German air force
  6. 11. The belief that violence is unjustifiable