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A Confederate officer had dropped a set of Lee's orders in the field, where they were found by Northern troops and brought to the attention of McClellan.

By chance, one of McClellan's aides was able to recognise the handwriting of the Confederate General who had signed the orders, confirming that they were genuine.

McClellan was sure he could destroy Lee's widely scattered divisions, one by one. Unfortunately, a Confederate spy in the camp was able to alert Lee, and McClellan did not move quickly enough to prevent Lee concentrating his forces at Antietam Creek.

The battle was Northern victory, but not the full knock-out blow it should have been.

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Q: How did the union army find the confederacy's battle plans before the Battle of Antietam?
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