October 1, 1862
On October 1, 1862, the Confederate War Department issued General Orders, No. 73, creating the Department of Mississippi and East Louisiana under the command of Major General John C. Pemberton.
GENERAL ORDERS, No. 73
ADJT. AND INSPECTOR GENERALS OFFICE,
Richmond, Va. October 1, 1862.
I. The State of Mississippi and that part of Louisiana east of the Mississippi River is constituted a separate military department, the command of which is assigned to Maj. Gen. John C. Pemberton.
Adjutant and Inspector General.