At two o'clock, on the morning of Monday, June 15th, with the most perfect silence, and in extreme darkness, the fortifications were evacuated, and the command of General Milroy commenced its march in the order and by the route designated. The bold and energetic resistance of the day previous had led the enemy to expect a renewal of the contest on Monday morning. Hence he was completely deceived and eluded; and the head of the retreating column had proceeded four and a half miles from Winchester, when suddenly, while it was yet quite dark, it encountered Johnson's division of Ewell's corps, eight or ten thousand strong, posted at the junction of the roads to Martinsburg and Summit Point. The commanding general, expecting only an attack from behind, was near the rear when the firing began. He immediately hastened to the scene of action, and in riding up to the front, and passing Colonel McReynolds, some distance ahead of his troops, ordered him to go back and hurry up his brigade. The forces of the 1st and 2d brigades were at once thrown into line of battle, the former on the left and parallel with the Martinsburg road, and the latter at right angles with the road, facing the woods in which the enemy were posted. The first brigade, by a gallant charge, succeeded in driving the enemy from their guns; the second, led by General Milroy in person, was three times repulsed by greatly superior numbers. Pending these successive charges, during which General Milroy's horse was shot under him, he awaited the arrival of the 3d brigade, and sent repeated messengers to order it up. His purpose was only to engage the enemy long enough to enable the whole column to pass away under cover of the severe blow he had given the enemy in the first charges of the two brigades engaged. But, unfortunately, the only part of the 3d brigade which could be found upon the field was the 1st New York Cavalry, which had been drawn up in line of battle by Major Adams, without having received any orders from the brigade commander. The rest of the brigade had gone to the right in the early part of the conflict, and, with the exception of the 6th Maryland Volunteers, became disorganized and scattered. Colonel McReynolds himself became separated from his troops, and reached Harper's Ferry alone, among the first who arrived.