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Today in History: Battle of Antietam leaves nearly 23,000 casualties

9/17/2025

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Story summary

On September 17, 1862, the Battle of Antietam occurred near Sharpsburg, Maryland, during the American Civil War. This pivotal clash between Confederate General Robert E. Lee and Union Major General George B. McClellan resulted in nearly 23,000 casualties, marking the bloodiest day in American history. Despite heavier losses, the Union's strategic position improved significantly.

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Story summary

On September 17, 1862, the Battle of Antietam occurred near Sharpsburg, Maryland, during the American Civil War. This pivotal clash between Confederate General Robert E. Lee and Union Major General George B. McClellan resulted in nearly 23,000 casualties, marking the bloodiest day in American history. Despite heavier losses, the Union's strategic position improved significantly.