Information of the state of affairs in our rear having reached Chancellorsville, General McLaws, with his three brigades and one of General Anderson's, was ordered to reinforce General Wilcox. He arrived at Salem church early in the afternoon, where he found General Wilcox in line of battle, with a large force of the enemy--consisting, as was reported, of one army corps and part of another, under Major-General Sedgwick--in his front. The brigades of General Kershaw and General Wofford were placed on the right of General Wilcox and those of Semmes and Mahone on the left. The enemy's artillery played vigorously upon our position for some time, when his infantry advanced in three strong lines, the attack being directed mainly against General Wilcox, but partially involving the brigades on his left. The assault was met with the utmost firmness, and after a fierce struggle the first line was repulsed with great slaughter. The second then came forward, but immediately broke under the close and deadly fire which it encountered, and the whole mass fled in confusion to the rear. They were pursued by the brigades of General Wilcox and General Semmes, in the direction of Banks's Ford, where the enemy crossed to the Stafford side of the river. The next morning General Early advanced along the Telegraph road and recaptured Marye's Heights and the adjacent hills without difficulty. General Barksdale's brigade entered the town, to find the enemy gone, with the exception of some stragglers who had secreted themselves in cellars and elsewhere about town. These were captured and sent to the rear, and the brigade took up its former quarters in the town, where it remained until the first of June. After some four weeks of rest and reorganization the army was again put in motion, the object of Gen. Lee being the invasion of Pennsylvania. After the removal of the army Fredericksburg was left practically without any armed troops, and soon relapsed into her usual quiet, so characteristic of the place. This condition of things existed until the return of the army from its invasion in the Fall, when the town was occasionally visited by scouting cavalry from the Confederate army, the main body of the troops camping west of Fredericksburg. GEN. GRANT'S ARMY IN POSSESSION. _The Wilderness Campaign._