History Crossword (Is challenging)

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Across
  1. 2. King of the Franks and founder of the Holy Roman Empire
  2. 5. Austro-Hungarian colony in China
  3. 6. Atrocity the Japanese committed during WW2 in China
  4. 8. Capital of Finland
  5. 9. "The Desert Fox", German WW2 general
  6. 11. unofficial capital of Switzerland
  7. 13. WW2 simulator
  8. 14. Capital of Latvia
  9. 15. American Nuclear program during WW2
  10. 17. Largest tank battle to date
  11. 19. Capital of Tunisia
  12. 21. Founder and leader of Turkey
  13. 25. Capital of Norway
  14. 29. Prussian monarch that partitioned Poland in 1772
  15. 31. One of the few Diarchies in the world
  16. 32. Wanted to nuke China during the Korean War
  17. 33. Capital of Iceland
  18. 34. German WW1 general and chancellor of Germany
  19. 37. Capital of Portugal
  20. 39. Capital of Slovenia
  21. 40. Captial of Liechtenstein
  22. 41. Longest siege of WW2
  23. 42. Capital of Slovakia
  24. 43. Supreme commander of allied forces during WW2 and future president of the U.S.
  25. 44. Pacific battle during WW2 where the U.S. anticipated Japan
Down
  1. 1. Viking who found the America's
  2. 3. Capital of Estonia
  3. 4. Finnish war against the Soviets, in which the Soviets were humiliated but defeated the Finnish
  4. 7. Sniper with most confirmed kills and was 5'3" (nickname)
  5. 10. Greek version of Hercules
  6. 12. Finnish war against the Soviets after Operation Barbarossa
  7. 16. Capital of Algeria
  8. 18. WW1 treaty that deeply hurt Hungary
  9. 20. American sniper during Vietnam and had a signature item on his helmet (nickname)
  10. 22. Non-aggression pact between Germany and the Soviet Union
  11. 23. Capital of Belarus
  12. 24. Country that has not been under any significant change of government since the time of the Roman Empire
  13. 26. Country that surrendered to Germany in 6 hours in WW2
  14. 27. German superheavy tank that was never made with only prototypes produced
  15. 28. Japanese war criminal (real bad guy)
  16. 30. Capital of Bulgaria
  17. 35. Capital of Lithuania
  18. 36. Soviet general responsible for the defense of Moscow during WW2
  19. 38. Crown jewel of the British Empire