... These forces, styled by me for convenience and propriety of description, the Army of the Mississippi, consisted of parts of two corps d'armee; namely, the Thirteenth, my own, and the Fifteenth, Major-Gen. Sherman 's. Desiring to give my undivided attention to matters affecting the general command, I immediately assigned Brig.-General Geo. W. Morgan, a tried and meritorious officer, to the command of the Thirte...