The 31st Mississippi Infantry was organized by the increase of the 5th Infantry Battalion to a regiment during the winter of 1861-1862.
The 31st Mississippi Infantry was placed on garrison duty at Vicksburg. There it was attached to the Department of Mississippi and East Louisiana. The regiment served with that command for much of its career.
In the spring of 1864 the unit was placed in the Army of Tennessee. On April 9, 1865 the regiment was consolidated with the 3rd and 40th Infantry Regiments and designated as the 3rd Infantry Regiment Consolidated at Smithfield, North Carolina. The army was surrendered near Durham Station April 26th.
Company A -- Orr Guards [J.A. Orr] (raised in Pontotoc County, MS)
Company B -- Dixie Guards, aka Avent Company, & aka Avent Rebels (raised in Choctaw County, MS)
Company C -- Capt. Hill's Company, aka Chickasaw Guards, & aka Old Chickasaw (raised in Chickasaw County, MS)
Company D -- Dixie Rebels (raised in Calhoun County, MS)
Company E -- Choctaw Rebels, aka Choctaw Greys (raised in Choctaw County, MS)
Company F -- Calhoun Tigers (raised in Calhoun County, MS)
Company G -- Orr Guards [H.C. Orr] (raised in Pontotoc County, MS)
Company H -- Capt. Jenning's Company (raised in Itawamba County, MS)
Company I -- Jackson Rifles (raised in Choctaw County, MS)
Company K -- Capt. McWhorter's Company (raised in Pontotoc County, MS)
