When Hooker moved to the right at Bolivar by way of the Hagerstown road, Gibbon continued on the main road and attacked Colquitt, who was positioned about 700 yards southeast of this point. He drove Colquitt's skirmishers and reached the bend in the road in Colquitt's front, but was unable to drive Colquitt and bivouacked in his front. When darkness ended the engagement, Cox's Division of the Ninth Corps held the summit of the mountain south of Fox's Gap, Hooker's First Corps held the high ground northeast commanding the Confederate line of retreat on Boonsboro, and Gibbon held the ground he had gained along the turnpike to the south. With the Confederate line of retreat in great jeopardy, Lee immediately after dark put his army in motion for Sharpsburg, where Jackson, Walker, and McLaws joined him.
