..., with his own and Walker's divisions, at 1 A. M., for Sharpsburg, distant 17 miles. By a rapid night march he arrived early on the 16th, having forded the Potomac at daylight, at Boteler's Ford near Shepherdstown . McLaws extricated himself from Pleasant Valley by coming into Harper's Ferry. Here he was much delayed in crossing the pontoon bridge with his trains and getting through the crowded streets. I...