den's Virginia battery; the Fourth, under Col. Arnold Elzey, composed of the First Maryland battalion, Third Tennessee, Tenth and Thirteenth Virginia, and Grove's battery, leaving the First Virginia cavalry and the Thirty-third Virginia infantry unbrigaded. These commands numbered, on June 30, 1861, 10,654 present for duty, of which 10,010 were infantry, 334 cavalry and 278 artillery.
Learning that Patterson was again preparing to cross the Potomac, Jackson was sent with his brigade to the vicinity of Martinsburg to support the cavalry, and at the same time protect and aid an agent of the government who was sent to select and remove locomotives from the Baltimore & Ohio railroad shops at Martinsburg, hauling them with horses along the turnpike through Winchester to the Manassas Gap railroad at Strasburg. Jackson was also instructed to destroy all Baltimore & Ohio rolling stock that could not be brought away. On June 22d, President Davis wrote General Johnston that if the enemy had withdrawn from his front to make an attack east of the Blue ridge, they would probably attempt to advance from Leesburg to seize the Manassas Gap railroad and turn Beauregard's left, and if he had timely information of this, he might make a flank attack through the passes of the Blue ridge, and in conjunction with Beauregard, achieve a glorious and beneficial victory.
During this waiting time some 2,500 of the militia of Frederick, Shenandoah and adjacent counties, were assembled at Winchester, under Brigadier-Generals Carson and Meem. To encourage these and add to their efficiency, Major Whiting, of the engineers, was directed to throw up some light defensive works, on the most commanding positions northeast of the town, and have some heavy guns, found in Winchester, mounted there.
Maj.-Gen. Robert Patterson, with the Federal army which he had concentrated, left Hagerstown June 30th, with the intention of invading Virginia in two columns, one crossing the Potomac at Dam No. 4, and the other at Williamsport, to converge at Hainesville, near which, at Camp Stephens, was encamped Jackson's brigade. Finding the fording difficult at Dam No. 4, his whole force crossed the Potomac at Williamsport, July 2d, and advanced on the main road toward Martinsburg, detaching Negley's brigade, a mile beyond the ford, to march by
