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Harpers Ferry

A largely accidental battle, pitting Robert E. Lee against George B. McClellan, became the single deadliest day in America's history and changed the course of the Civil War.

The day of Antietam—September 17, 1862 — was like no other day of the Civil War. “The roar of the infantry was beyond anything conceivable to the uninitiated,” wrote a Union officer who fought there.

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