...e entire militia of the State. Lee had about a week the start of Hooker in the race for the Potomac. On the 15th 1,500 Confederate cavalry dashed across the Potomac at Williamsport, in pursuit of Milroy 's wagon-train; swept up the Cumberland Valley to Chambersburg, Pa.; destroyed the railroad in that vicinity; plundered the region of horses, cattle, and other supplies; and, with fifty kidnapped negr...