At the same time, Lieutenant-Colonel Davis, of the Twelfth Illinois, was ordered to penetrate to the Fredericksburg railroad, and, if possible, to the Virginia Central, and destroy communications. If he crossed the Virginia Central he was to make for Williamsburg on the peninsula. Leaving the main body on the South Anna, on Sunday, May 3d, he passed down the bank of that river, burning a bridge, and, dispersing a mounted party of the enemy, struck the railroad at Ashland. Here he cut the telegraph, tore up some rails, and burned the trestle-work bridge south of the town. At the same time a train of cars, filled with sick and wounded, arrived, and was captured. The prisoners were paroled, and the locomotives disabled. Twenty wagons, with horses, were destroyed, and several horses taken. Leaving at 6 P. M., a train of eighteen wagons was met and destroyed, and Hanover Station reached at 8 P. M. Here thirty prisoners were captured, and the railroad line broken. The depot, storehouses, and stables, filled with government property were destroyed, also a culvert and trestle-work south of the station. Among the property destroyed were more than one hundred wagons, a thousand sacks of flour and corn, and a large quantity of clothing and horse equipments. The command then moved down within seven miles of Richmond, and thence marched to Williamsburg, and then proceeded to Gloucester Point, having destroyed property of the enemy valued at a million dollars. Colonel Davis’s loss was thirty-five men. HOOKER’S ADVANCE. The weather now became very inclement; and storms succeeded each other for several days. It was not till the 27th that the movement to cross the Rappahannock was finally effected. General Hooker’s army numbered about one hundred and twenty thousand men, who were divided into seven separate corps. The army of General Lee numbered about seventy thousand men; it held a line running from northwest to southeast, with its right wing extending to Port Hudson on the Rappahannock, and its left resting above Fredericksburg.