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Immediately upon the enemy's ascertaining that General Hunter was retreating from Lynchburg by way of the Kanawha River, thus laying the Shenandoah Valley open for raid into Maryland and Pennsylvania, he returned northward and moved down that valley. As soon as this movement of the enemy was ascertained, General Hunter, who had reached the Kanawha River, was directed to move his troops without delay, by river and railroad, to Harper's Ferry; but owing to the difficulty of navigation by reason of low water and breaks in the railroad, great delay was experienced in getting there. It became necessary, therefore, to find other troops to check this movement of the enemy. For this purpose the 6th corps was taken from the armies operating against Richmond, to which was added the 19th corps, then fortunately beginning to arrive in Hampton Roads from the Gulf Department, under orders issued immediately after the ascertainment of the result of the Red River expedition. The garrisons of Baltimore and Washington were at this time made up of heavy-artillery regiments, hundred days' men, and detachments from the invalid corps. One division under command of General Ricketts, of the 6th corps, was sent to Baltimore, and the remaining two divisions of the 6th corps, under General Wright, were subsequently sent to Washington. On the 3d of July the enemy approached Martinsburg. General Sigel, who was in command of our forces there, retreated across the Potomac at Shepherdtown; and General Weber, commanding at Harper's Ferry, crossed the occupied Hagerstown, moving a strong column towards Frederick City. General Wallace, with Rickett's division and his own command, the latter mostly new and undisciplined troops, pushed out from Baltimore with great promptness, and met the enemy in force on the Monocacy, near the crossing of the railroad bridge. His force was not sufficient to insure success, but he fought the enemy nevertheless, and although it resulted in a defeat to our arms, yet it detained the enemy, and thereby served to enable General Wright to reach Washington with two division of the 6th corps, and the advance of the 19th corps, before him. From Monocacy the enemy moved on Washington, his cavalry advance reaching Rockville on the evening of the 10th. On the 12th a reconnoissance was thrown out in front of Fort Stevens, to ascertain the enemy's position and force. A severe skirmish ensued, in which we lost about two hundred and eighty in killed and wounded. The enemy's loss was probably greater. He commenced retreating during the night. Learning the exact condition of affairs at Washington, I requested by telegraph, at forty-five minutes past eleven P.M., on the 12th, the assignment of Major-General H. G. Wright to the command of all the troops that could be made available to operate in the field against the enemy, and directed that he should get outside of the trenches with all the force he could, and push Early to the last moment. General Wright commenced the pursuit on the 13th; on the 18th the enemy was overtaken at Snicker's Ferry, on the Shenandoah, when a sharp skirmish occurred; and on the 20th, General Averell encountered and defeated a portion of the rebel army at Winchester, capturing four pieces of artillery and several hundred prisoners.
Learning that Early was retreating south towards Lynchburg or Richmond, I directed that the 6th and 19th corps be got back to the armies operating against Richmond, so that they might be used in a movement against Lee before the return of the troops sent by him into the valley; and that Hunter should remain in the Shenandoah Valley, keeping between any force of the enemy and Washington, acting on the defensive as much as possible. I felt that if the enemy had any notion of returning, the fact would be developed before the 6th and 19th corps could leave Washington. Subsequently, the 19th corps was excepted form the order to return to the James.