...am running in this locality, nearly from West to East, to its confluence with the Occoquan River, about twelve miles from the Potomac, and draining a considerable scope of country, from its source in Bull Run Mountain , to a short distance of the Potomac at Occoquan. At this season, habitually low and sluggish, it is, however, rapidly and frequently swollen by the summer rains until unfordable. The banks for th...