This unit was attached to Col. A. Jackson, Jr.'s and Lt. Col. R. Sterling's 1st Tennessee Heavy Artillery, of Col. Edward Higgins' River Defense Batteries, Lt. Gen. John C. Pemberton's Army of Vicksburg, and commanded by Capt. J. B. Caruthers. [Refer to Edwin Bearss' The Vicksburg Campaign, Volume III, pages 873 and 968.]
