Browsing named entities in Maj. Jed. Hotchkiss, Confederate Military History, a library of Confederate States Military History: Volume 3, Virginia (ed. Clement Anselm Evans). You can also browse the collection for September 13th or search for September 13th in all documents.

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knowledge of him before the existing war, but especially from his doings in leading the great army of the Potomac, in the on to Richmond and in the back to Washington, and therefore could not account for his unusual diligence in pursuing him westward from the Monocacy, to reach which from Washington he had been marching with great caution. McClellan's report, published by the Federal government the following winter, furnished the explanation. On the morning of this same Saturday, the 13th of September, after McClellan had occupied Frederick on the 12th, there was handed him an official copy of Lee's order No. 191, which revealed, in detail, the entire plan of the pending campaign, and showed him, at a glance, how Lee's knights and castles on the military chess-board were disposed, and that a rare opportunity was offered for falling upon his greatly weakened left rear and crushing that before he could gather his scattered forces to his aid, as McClellan had the great advantage of the
returns from hospitals and elsewhere, his army had increased to 58,600 men. On the 9th of September, he detached Longstreet, with two of his divisions, to help Bragg, in Tennessee, keep back Rosecrans from marching farther up the Great valley toward Virginia, leaving with himself some 46,000 men. Longstreet wrote, in farewell to Lee, speaking for himself and his corps: Our affections for you are stronger, if it is possible for them to be stronger, than our admiration for you. On the 13th of September, Meade advanced, from beyond the Rappahannock, to learn what Lee was doing; the latter awaited an attack in the position he had chosen and partially fortified, in front of Orange Court House, overlooking the Rapidan. Meade took a distant look at the preparations made for him, and then withdrew to camps in Culpeper. After learning of the battle at Chickamauga, Lee, on the 25th, wrote pleasantly to Longstreet: My whole heart and soul have been with you and your brave corps in you