Harper's Ferry, following in pursuit and investing that place with his left resting on the Potomac and his right on the Shenandoah. Walker's division, which had been advanced from Frederick along the line of the Baltimore & Ohio toward Harper's Ferry, was to cross the Potomac at Cheek's ford, and occupy Loudoun heights, connecting with Jackson's right and thus extending the investment from the Shenandoah to the Potomac below Harper's Ferry. Longstreet's command was to follow Jackson across the Blue ridge and halt at Boonsboro, in the Great valley, at the western foot of the mountain. McLaws, with his own and Anderson's division, was to follow Longstreet as far as Middletown, in the Catoctin valley, and there turn to the southwest, by roads leading toward Harper's Ferry, and from the rear secure possession of Maryland heights, resting his left on the Potomac below Harper's Ferry, opposite Walker's right, and his right on the same river above Harper's Ferry, opposite Jackson's left, thus completing the circle of investment. D. H. Hill was to bring up the rear on the National road, preceded by the ordnance and supply trains and reserve artillery, at the same time guarding the rear of both McLaws and Longstreet. Stuart, after furnishing squadrons of cavalry to Jackson, Longstreet and McLaws, was to cover the entire rear of the army with the main body of his cavalry.
The conception of this plan of offensive operations and providing for defensive ones, was every way worthy of the famous commander of the army of Northern Virginia, and he felt confident of success because he had intrusted its execution to able hands. The prompt Jackson, always eager for the fray, and now burning with desire to capture the stronghold that had barred his way to Washington the last of the preceding May, marched at 3 in the morning of the 10th; bivouacked on the line of the Baltimore & Ohio, across the Potomac, at Williamsport, on the evening of the 11th; captured Martinsburg on the morning of the 12th; by noon of the 13th was in front of Harper's Ferry, and on that day completed his portion of its investment. Walker crossed the Potomac at Point of Rocks, after finding Cheek's ford covered by the enemy's artillery from the high bluffs east of the Monocacy, on the 10th, but did not reach the foot of the Blue ridge until the 13th, or complete his portion of the invest-
