... divided his army in order to clutch Harper's Ferry induced a general quickening of movement on our side. Still advancing, he approached, at noon on the 14th, the pass through Crampton's Gap in the South Mountain , just beyond Burkettsville, several miles south-westward of that at which Burnside, leading our main advance, had, some hours earlier, found his march obstructed by Hill. Before him was Howell Cobb...