...ut. T. E. Gregg; Capt. John C. Mitchel's company, I, First artillery, and Companies H and I of the Twentieth infantry, Capt. S. M. Roof and Lieut. M. Gunter. Yates masked his guns at Grimball's and Legare ‘s points, on John's island, and awaited his opportunity. The gunboat Isaac Smith, carrying a 30-pounder Parrott in her bow, and eight 8-inch columbiads, steamed up the river on the afternoo...