...retired to the mountain gaps and remained until the afternoon of the 29th, when he was recalled to the army by a courier from General Lee. At night on the 28th General Lee heard, through a scout at Chambersburg , of Hooker's advance. As no information of it had come from the cavalry he had left in Hooker's front in Virginia, he thought that Hooker was still there. He immediately issued an order for the c...