For a clear understanding of the operations which preceded the victories that resulted in almost annihilating General Early’s army in the Shenandoah Valley, it is necessary to describe in considerable detail the events that took place prior to the 19th of September.  My army marched from Harper’s Ferry on the 10th of August, 1864, General Torbert with Merritt’s division of cavalry moving in advance through Berryville, going into position near White Post.  The Sixth Corps, under General Wright, moved by way of Charlestown and Summit Point to Clifton; General Emory, with Dwight’s division of the Nineteenth Corps, marched along the Berryville pike through Berryville to the left of the position of the Sixth Corps at Clifton; General Crook’s command, moving on the Kabletown road, passed through Kabletown to the vicinity of Berryville, and went into position on the left of Dwight’s division, while Colonel Lowell, with a detached force of two small regiments of cavalry, marched to Summit Point; so that on the night of August 10 my infantry occupied a line stretching from Clifton to Berryville, with Merritt’s cavalry at White Post and Lowell’s at Summit Point.  The enemy, as stated before, moved at the same time from Bunker Hill and vicinity, and stretched his line from where the Winchester and Potomac railroad crosses Opequon Creek to the point at which the Berryville and Winchester pike crosses the same stream, thus occupying the west bank to cover Winchester.

On the morning of the 11th the Sixth Corps was ordered to move across the country toward the junction of the Berryville-Winchester pike and the Opequon, and to take the crossing and hold it, Dwight’s division being directed to move through Berryville on the White Post road for a mile, then file to the right by heads of regiments at deploying distances, and carry the crossing of Opequon Creek at a ford about three-fourths of a mile from the left of the Sixth Corps, while Crook was instructed to move out on the White Post road, a mile and a half beyond Berryville, then head to the right and secure the ford about a mile to the left of Dwight; Torbert’s orders were to push Merritt’s division up the Millwood pike toward Winchester, attack any force he might run against, and ascertain the movements of the Confederate army; and lastly, Lowell received instructions to close in from Summit Point on the right of the Sixth Corps.

My object in securing the fords was to further my march on Winchester from the southeast, since, from all the information gathered during the 10th, I still thought Early could be brought to a stand at that point; but in this I was mistaken, as Torbert’s reconnoissance proved, for on the morning of the 11th, when Merritt had driven the Confederate cavalry, then covering the Millwood pike west of the Opequon, off toward Kernstown, he found that their infantry and artillery were retreating south, up the Valley pike.