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First time round (Antietam, Sept '62), they happened to come across a set of Lee's orders which had been dropped in the field. This showed that Lee's divisions were widely separated, and that McClellan could destroy them one by one, if he moved fast enough. (He didn't quite, but still retained the advantage, and won the battle.)

Second time round (Gettysburg, July '63), it was not Union efforts but a half-hearted performance by Lee's deputy, General James Longstreet, and a mistaken tactic by Confederate cavalry, that lost Lee the battle - and the campaign.

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14y ago

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