What was the bloodiest battle of Germany's war with the Soviet Union?

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Tags

1. #barbarossa
2. #against
3. #fought
4. #described
5. #germany
6. #crossed
7. #borders
8. #between
9. #thereby
10. #conflict
11. #union
12. #soviet
13. #began
14. #finland
15. #offensive
16. #allies
17. #german
18. #nonaggression
19. #forces
20. #operation
21. #invading