Here's Jackman's command at the time, I could not locate Maddox in any of these commands.

Col. SIDNEY D. JACKMAN.

Jackman's (Missouri) Cavalry, Lieut. Col. C. H. Nichols.
Hunter's (Missouri) Cavalry, Col. De Witt C. Hunter.
Williams' (Missouri) Cavalry Battalion, Lieut. Col. D. A. Williams.
Schnable's (Missouri) Cavalry Battalion, Lieut. Col. John A. Schnable.
Collins' (Missouri) Battery (one section), Lieut. Jacob D. Connor.

This brigade on the 20th of August last was encamped near Batesville, and consisted of the regiments of Colonels Hunter and Coffee and my own regiment, under the command of Lieutenant Colonel Nichols, and the battalion of Lieutenant-Colonel Schnable, its entire strength being about 1,500.