Grayson did not depart Englishtown until 06:00, an hour after news arrived that Clinton was on the move. Both vanguard and main body broke camp immediately, and both were slow to move; the vanguard was delayed when brigades formed up in the wrong march order and the main body was slowed by its artillery train. At 07:00, Lee rode ahead to scout the situation for himself. Following some confusion when a militia rider erroneously reported the British were not withdrawing but preparing to attack, Lee learned that the British had begun moving at 02:00 and only a small party of infantry and cavalry remained in the area.