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Lee had split his army into several divisions in the South Mountains (Maryland), and McLellan did not know their location.

However a set of Lee's orders fell into McLellan's hands, showing the proposed movements of these units. This put him in a strong position to destroy each of them in turn.

He would have been able to do this, if there hadn't been a Confederate spy in the camp, who reported the situation to Lee. So Lee had to concentrate his army in one place, and that was Antietam Creek, Sharpsburg.

The North won this battle, but did not manage to destroy Lee's Army, which was able to retreat to Virginia.

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15y ago

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