23 h 19 m, 17 sept 1862 año - Antietam
Descripción:
 The Battle of Antietam, a.k.a. Battle of Sharpsburg, resulted in not only the bloodiest day of the American Civil War, but the bloodiest single day in all of American history. Fought between the town of Sharpsburg, Maryland, and Antietam Creek, it ended in Union victory. 
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23 h 19 m, 17 sept 1862 año
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 ~ 163 years ago