Battle of Antietam?

Answer:
The battle of Antietam was said to be the single-most bloodiest day of the war. Thousands of lives were lost at this battle, perhaps the most of any of the battles. This battle was a Union (North) defeat.
First answer by ID1276133665. Last edit by Jokergirl4467. Contributor trust: 29 [recommend contributor recommended]. Question popularity: 36 [recommend question].