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On September 16, Maj. Gen. George B. McClellan confronted Lee’s Army of Northern Virginia at
Sharpsburg, Maryland. At dawn September 17, Hooker’s corps mounted a powerful assault on Lee’s left flank that
began the single bloodiest day in American military history. Attacks and counterattacks swept across Miller’s
cornfield and fighting swirled around the Dunker Church. Union assaults against the Sunken Road eventually pierced
the Confederate center, but the Federal advantage was not followed up. Late in the day, Burnside’s corps finally got
into action, crossing the stone bridge over Antietam Creek and rolling up the Confederate right. At a crucial
moment, A.P. Hill’s division arrived from Harpers Ferry and counterattacked, driving back Burnside and saving the
day. Although outnumbered two-to-one, Lee committed his entire force, while McClellan sent in less than
three-quarters of his army, enabling Lee to fight the Federals to a standstill. During the night, both armies
consolidated their lines. In spite of crippling casualties, Lee continued to skirmish with McClellan throughout the
18th, while removing his wounded south of the river. McClellan did not renew the assaults. After dark, Lee ordered
the battered Army of Northern Virginia to withdraw across the Potomac into the Shenandoah Valley. |