We started at 7 o’clock and marched fifteen miles. Bivouacked for the night on the banks of the Tuscumbie river. It was very warm and dusty marching, but all held their places in the ranks. It is said that the rebels’ cavalry which kept up close to our rear guard, had something to do with keeping the men in line, for anyone falling out behind would surely have been taken prisoner.
Source: Alexander G. Downing, Edited by Olynthus B., Clark, Downing’s Civil War Diary, p. 68