...l W. F. Smith, was busy upon a plan for opening the line of railway on the south side, and his first step was to break up the line of sharp-shooters. On the 19th he made a survey of the river below Chattanooga . On the same day General Rosecrans was superseded in command by General George H. Thomas. A day or two after that my signal party reported some stir about the enemy's camps near Bridgeport, and t...