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Chance.

A Confederate officer managed to lose a copy of Lee's orders.

They were found by Union soldiers and shown to McLellan, who saw that Lee had divided his army into widely-separated divisions.

McLellan might have been able to destroy these divisions, one by one. But there had been a Confederate spy in the camp, who alerted Lee, who then concentrated his troops at Antietam Creek, by Sharpsburg.

The Union still won the battle, but was not able to destroy the Confederate army, which escaped back to Virginia.

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15y ago

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