...here during the day, and burn Back Creek bridge, on the Baltimore and Ohio Railroad, to-night. Colonel Pierce at once despatched a detachment of forty men of the Twelfth Pennsylvania cavalry, under Captain George W. Henrie , on the Pughtown road, and another of fifty, of the First New York, under Captain Richard Pendegrass, on the Hedgesville road; the one to flank them on the right, the other on the left. This they d...