_November 28._--A strong force of Rebel cavalry, under General Wade Hampton, dashed across the river at some of the upper fords, raided up around Dumfries and the Occoquan, captured several prisoners and wagons, and returned to their side of the river without loss. As a sort of offset to this, on the twenty-ninth, General Julius Stahel, who commanded a brigade of cavalry at Fairfax Court House, commenced an expedition of great daring and success, to the Shenandoah Valley. Having advanced to Snicker's Gap in the Blue Ridge, a strong Rebel picket-post was captured by our vanguard. Pressing forward on the main thoroughfare, they soon reached the Shenandoah river, and were not a little annoyed by Rebel carbineers, hidden behind old buildings across the stream. Captain Abram H. Krom, commanding a detachment of the Fifth New York Cavalry, and leading the advance, dashed across the river, though deep and the current swift, closely followed by his men. On reaching the opposite bank, a charge was ordered, and executed in so gallant a manner that several Rebels were made prisoners, and the remainder of the squad was driven away at a breakneck speed. Our men pursued them in a scrambling race for nearly three miles, when they came upon a Rebel camp, which was attacked in a furious manner. Our boys made noise enough for a brigade, though only a squadron was at hand. The enemy attempted a defence, but utterly failed. Reenforcements coming to our aid, the Rebels were thoroughly beaten and driven away, leaving in our hands one captain, two lieutenants, thirty-two privates, one stand of colors, and several wagons and ambulances. Most of these were laden with booty taken by White's guerillas in a recent raid into Poolesville, Maryland. Sixty horses and fifty heads of cattle were also captured in this gallant charge. With all their spoils the expedition returned, via Leesburg, arriving at their camps in safety. But all eyes were turned expectantly towards Fredericksburg, with its two vast armies preparing for a grand encounter. Nearly all the citizens of the city had left their homes and fled southward. While General Burnside waited for his pontoons, General Lee was fortifying the Heights in rear of the city, and concentrating his forces for the anticipated onset. This state of things was greatly regretted.