Pratt's-Hynson's Battery was organized during the early spring of 1862 and served in the Trans-Mississippi Department. It saw action in Marmaduke's Raid into Missouri and later the conflicts at Little Rock and Pine Bluff. The unit moved to Louisiana, participated in the Red River Campaign, then was part of Green's operations on the Mississippi River. It was assigned to the 2nd Artillery Battalion and surrendered on June 2, 1865, at Marshall, Texas, with no guns. Captains J. H. Pratt and H. C. Hynson were in command.