Why was the Battle of Stalingrad the bloodiest battle?

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Tags

1. #reinforce
2. #resulting
3. #battles
4. #heavily
5. #losses
6. #bloodiest
7. #their
8. #world
9. #considered
10. #force
11. #battle
12. #stalingrad
13. #withdrawal
14. #military
15. #history
16. #defeated
17. #major
18. #forces