How did the lost order #191 the union?

The Lost Order #191 helped the Union Army as it provided strategic intel about some plans of theConfederate Army. By finding the Order, the Union Army discovered strategic guidelines issued during the Maryland Campaign  by the Command of the Confederate Army. This information unveiled strategic movements of the confederate and helped the Union to counteract. Without doubt, the accidental finding of the order provided an stratetic advantage to the Union Army.

Explanation:

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