... current rumor in Alexandria during the afternoon, and was only set at rest by the arrival of the train after an absence of half a day. A Philadelphian, who had been within a mile and a half of Fairfax Court-House, also met the train at Arlington mills, bringing information that troops were arriving at Fairfax Court-House from Manassas Junction.--He was standing on a hill near Fairfax, heard drums ...