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How many casualties did both sides suffer during the Battle of Antietam?
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Battle of Antietam
Confederate dead by a fence on the Hagerstown road, Antietam, Maryland, photo by Alexander Gardner, September 1862. The Battle of Antietam was one of the costliest of the Civil War.
The Battle of Antietam, fought on September 17, 1862, resulted in significant casualties for both sides. The Union forces suffered 12,401 casualties, while the Confederate Army of Northern Virginia sustained 10,316 casualties. This engagement is noted as the single bloodiest day in U.S. military history. Among the fallen were six generals, three from the Union and three from the Confederacy, with a dozen more wounded.1