The army left Martinsburg for the south, as we have seen, on Monday, July 15th. The whole division, with trifling exceptions, moved forward, and advanced on that day as far as ‘Bunker Hill,’ ten miles from Martinsburg. An insignificant rebel force fell back as Patterson advanced, and at ‘Bunker Hill’ the army encamped around the smoking brands of the rebel camp-fires, just deserted. Here was a small post-town called Mill Creek; and near by, the high ridge called ’Bunker Hill’ formed another fine natural position for defence; but the rebels were not disposed to defend it. Patterson lay here two days, within twelve miles of the rebel strong-hold at Winchester, the pickets of the two armies watching each other by night and day. On the 17th the Federal army was astir before daylight, and an advance to the south was commenced. But before the rear-guard filed down from ‘Bunker Hill’ to the turnpike, a counter-march was ordered; and the whole division proceeded twelve miles to the east, leaving Winchester on their flank, and occupying Charlestown, in Jefferson County. What could have pleased Johnston better? What wonder that he should take the opportunity, as soon as satisfied that this flank movement was not intended to operate against him, to leave his fortifications at Winchester in charge of a small force, and rush to reinforce Beauregard? And is it not more than remarkable that Patterson, after occupying Charlestown for four days, should fall back to Harper’s Ferry on the very day when his foe had effected his ruse de guerre, and was actually turning the tide of battle at Bull Run?