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nd the Ninth corps, by Damascus, on New-Market and Frederick. The Second and Eleventh corps, under Generals Sumner and Williams, on the sixth were moved from Tenallytown to Rockville, thence by Middlebury and Urbana on Frederick, the Eleventh corps moving by a lateral road between Urbana and New-Market, thus maintaining the communication between the centre and right wing, as well as covering the direct route from Frederick to Washington. The Sixth corps, under Gen. Franklin, was moved to Darnestown on the sixth instant, thence by Dawsonville and Barnsville on Buckeystown, covering the road from the mouth of the Monocacy to Rockville, and being in position to connect with and support the centre should it have been necessary (as was supposed) to force the line of the Monocacy. Couch's division was thrown forward to Offut's Cross-Roads and Poolesville by the river road, thus covering that approach, watching the fords of the Potomac, and ultimately following and supporting the Sixth cor
l troops could be collected for its defence. Had the army of the Potomac arrived a few days earlier, the rebel army could have been easily defeated and perhaps destroyed. Seeing that an attack upon Washington would now be futile, Lee pushed his main army across the Potomac for a raid into Maryland and Pennsylvania. Gen. McClellan was directed to pursue him with all troops which were not required for the defence of Washington. Several corps were immediately thrown out in observation at Darnestown and Leesboro, and most of his army was in motion by the fifth of September. A portion entered Frederick on the twelfth. As the campaign was to be carried on within the department commanded by Major-Gen. Wool, I directed Gen. McClellan to assume control of all troops within his reach, without regard to departmental lines. The garrisons of Winchester and Martinsburgh had been withdrawn to Harper's Ferry, and the commanding officer of that post had been advised by my chief of staff to main