Why was the Battle of Antietam the bloodiest?

Related questions

1. Is Leningrad the same as St Petersburg?
2. How many D Day vets are still alive?
3. Why was Stalingrad called Stalingrad?
4. Why did Germans surrender?
5. What was Stalingrad original name?
6. Which is the bravest battle ever fought?
7. What is the name of Stalingrad today?
8. Why did Battle of Stalingrad happen?
9. Why was the death toll so high in the Civil War?
10. How many died at Stalingrad?

Tags

1. #confederate
2. #civil
3. #bloodiest
4. #clashed
5. #history
6. #troops
7. #wounded
8. #remains
9. #fields
10. #sharpsburg
11. #union
12. #battle
13. #roads
14. #crossroads
15. #killed
16. #course
17. #changed
18. #american
19. #single
20. #antietam
21. #years
22. #morning
23. #woods