 Thus only two hours in the day, centered around noon, were allowed for train traffic through the Harpers Ferry area after the middle of May.This timetable bottleneck caused the B&O Railroad to pile up trains in yards and along the lines on the double tracks on either side of Harpers Ferry in order to maximize their throughput during this new curfew.On the night of May 22, Jackson sent the 5th Virginia Infantry under Kenton Harper to Cherry Run, west of Martinsburg, and he sent Captain John D. Imboden's cavalry to Point of Rocks, east of Harpers Ferry.