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 the ninth, under Reno; the twelfth, which had been transferred from Banks to old General Mansfield; and finally, the two divisions of Sykes and Couch, detached from the corps of Porter and Keyes. This army numbered eighty-seven thousand one hundred and sixty-four men of all arms. McClellan divided it into three parts. The right wing, comprising the first and ninth corps, was placed under Burnside; Sumner commanded the centre, composed of the second and twelfth; the sixth, with the divisions of Couch and Sykes—the latter belonging to Porter's corps—constituted provisionally the left under Franklin. That portion of Maryland through which the Federals were going to pass is very rough and wooded, but the roads are numerous and practicable. Thus each corps could follow a different road, the left along the Potomac, the centre in the direction of Frederick, and the right more to northward, in such manner as to approach Baltimore. On the 9th of September, just as Lee was preparing to invest Harper's Ferry, the left and centre of the army of the Potomac occupied the line of the Seneca from the mouth of that river as far as Middlebrook, while it refused its right toward Brookville. Lee put his army in motion for Harper's Ferry on the 10th. On the morning of the 11th, McClellan hastened the march of his own troops, and having no fear for the safety of Baltimore pushed his right wing forward; the latter entered the town of Frederick on the 12th, after a slight engagement with the enemy's rear-guard. On the 13th the whole army had crossed the Monocacy, and the greater portion of it was concentrated around Frederick. By this time Lee, following the roads from Harper's Ferry and from Hagerstown, had placed the passes of South Mountain between his army and that of McClellan. The latter, however, was not yet able to fathom the designs of his adversary. Did he intend to make a screen of these defiles for a rapid invasion of Pennsylvania, or, according to the plan ascribed to him by General Halleck, was he going to descend again the right bank of the Potomac, to appear unexpectedly under the walls of Washington? However improbable this last supposition might be, the despatches he was receiving from his superior in command warned him, in such formal terms, to prepare for this eventuality, that he could not neglect it altogether in his
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