..., whither a gunboat, the Pontiac, Captain Luce, kindly furnished by Admiral Dahlgren, had preceded him to cover the crossing. In the meantime three divisions of the Fifteenth corps had closed up at Pocotaligo , and the right wing had loaded its wagons and was ready to start. I therefore directed General Howard to move one corps, the Seventeenth, along the Salkehatchie, as high up as Rivers' bridge, and t...