...ter to General Ewell, telling him if he was ready to move, to do so. The letter advised Ewell that his best course would be toward the Susquehanna, taking the routes by Emmittsburg, Chambersburg, and McConnellsburg , and that the trains, if possible, should be kept on the centre route, and the cavalry should be used in gathering supplies, obtaining information and protecting his flanks. It will depend (said Ge...