The Fourth Alabama Painting by Don Troiani

Reserves, Army of the Potomac

Private W E Sims, 1st Mississippi Battalion Infantry

Private W E Simms, 1st Mississippi Battalion Infantry

First Mississippi Battalion Infantry

Companies mustered in Confederate service independently and six companies arrived at Manassas Junction in the evening on 22 July, 1861. Not present at the first battle of Manassas and resdesignated the Twenty-first Mississippi Infantry in September 1861

COLONEL G B HUMPHREYS
Captain G B Humphreys, Company I, was appointed colonel at Camp Pickens, Manassas Junction.

LIEUTENANT COLONEL W L BRANDON

MAJOR J G TAYLOR
Major J G Taylor was transferred to the 2nd Mississippi Battalion Infantry on 1 November, 1861, and Captain D N Moody, Company A, was appointed major.

Company A Vicksburg Southrons: CAPT. D N Moody
The company was organised at Warren County, Mississippi, on 15 May, 1861, and was ordered to Richmond, Virginia, on 29 May, 1861. The company arrived at Richmond, Virginia, on 4 June, 1861, and was mustered in Confederate service by Captain J Scott on 5 June, 1861. Captain D N Moody was appointed major on 1 November, 1861, and Second Lieutenant D C Attwood was appointed captain.
Company B Jefferson or Jeff Davis Guards: CAPT. T B Manlove
The company was mustered in state service on at Woodville, Mississippi, on 7 May, 1861, and was mustered in Confederate service by Captain J Scott at Richmond, Virginia, on 4 June, 1861. The company was ordered to report at Yorktown, Virginia, and was assigned to the 2nd Mississippi Battaion Infantry, under the command of Lieutenant Colonel J G Taylor.
Company C Stephen Rifles or Guards: CAPT. W C F Brooks
The company was organised at Brookhaven, Lincoln County, Mississippi, in May 1861 and was ordered to proceed to Richmond, Virginia, on 5 June, 1861. The company arrived at Richmond, Virginia, on 9 June, 1861, and was mustered in Confederate service by Captain W C Holt at Howard's Grove, near Richmond, Virginia, on 13 June, 1861.
Company D Jeff Davis Guards: CAPT. J Simms
The company was mustered in state service at Woodville, Wilkinson County, Mississippi, on 24 May, 1861, and was mustered in Confederate service at Camp Davis, near Richmond, Virginia, on 5 June, 1861.
Company E Hurricane Rifles: CAPT. I D Stamps
The company was organised at Wilkinson County, Mississippi, on 1 June, 1861, and was ordered to New Orleans, Louisiana, on 19 June, 1861. The company was mustered in Confederate service at New Orleans, Louisiana, on 20 June, 1861, and arrived at Richmond, Virginia, on 29 June, 1861.
Company F Tallahatchie Rifles: CAPT. W H Fitzgerald
The company was mustered in state service at Tallahatchie County, Mississippi, on 27 April, 1861, and was mustered in Confederate service by Major H L Clay at Lynchburg, Virginia, on 7 July, 1861.
Company G Madison Guards: CAPT. W H Dudley
The company was organised at Canton, Madison County, Mississippi, on 15 July, 1861, ordered to join the 2nd Mississippi Battalion Infantry, which was ordered to Yorktown, Virginia, but the transfer was revoked and Company B, under the command of Captain T B Manlove, was ordered to report at Yorktown, Virginia.
Company H Warren Volunteers: CAPT. V Noland
The company was organised at Bovina, Warren County, Mississippi, on 1 June, 1861, and was ordered to Corinth, Mississippi, on 2 July, 1861. The company arrived at Corinth, Mississippi, on 3 July, 1861. The company was assigned to the 4th Mississippi Battalion Infantry, and was transferred to the 20th Mississippi Infantry at Iuka, Mississippi, on 6 July, 1861. The company arrived at Iuka, on 7 July, 1861, and was ordered to proceed to Lynchburg, Virginia, on 15 July, 1861, and was mustered in Confederate service by Major H L Clay on 18 July, 1861. The company was ordered to Camp Pickens, Manassas Junction, on 27 July, 1861, and arrived on 29 July, 1861.
Company I Sunflower Guards: CAPT. T S Gibson
The company was organised at Sunflower County, Mississippi, on 18 May, 1861, and was ordered to Richmond, Virginia, on 31 July, 1861. The company was mustered in Confederate service by Major H L Clay at Lynchburg, Virginia, on 9 August, 1861, and arrived at Camp Pickens, Manassas Junction, on 10 August, 1861.
Company K New Albany Greys: CAPT. R W Flournoy
The company was organised at New Albany, Mississippi, on 18 May, 1861, and was mustered in Mississippi state service on 22 May, 1861. The company was mustered in Confederate service by Major H L Clay at Lynchburg, Virginia, on 17 June, 1861, and arrived at Richmond, Virginia, on 26 June, 1861. The company was ordered to Camp Pickens, Manassas Junction, on 1 September 1861, and arrived the same day.
Company L Vicksburg Confederates: CAPT. R C Green
The company was stationed at Richmond, Virginia, and was ordered to Camp Pickens, Manassas Junction, on 16 September, 1861.

Sources

"On the 19th July we were ordered to be ready to set out for Manassas. We reported at the depôt, but could not go forward for want of transportation, preference being given to Hampton's Legion, in consequence of their having artillery."

The University memorial: Biographical sketches of alumni of the University of Virginia who fell in the Confederate War, five Volumes in one, by Rev John Lipscomb Johnson, B A

Supplement to the Official Records: Part II, Record of Events, Volume 33, Serial No.45: Record of events for Twenty-first Mississippi Infantry, May 1861–March 1865, edited by James B Hewett

Crimson Confederates: Harvard men who fought for the South, by Helen Trimpi

Notes

The 1st Mississippi Battalion Infantry, Companies A, B, C, D, E, F, and K was organised at Camp Davis, near Richmond, Virginia, under the command of Lieutenant Colonel W L Brandon and Major J G Taylor, and the companies were mustered in Confederate service for the war independently. Companies A, B, C, D, E, and F were ordered to proceed to Camp Pickens, Manassas Junction, on 19 July, 1861, and reported to the railroad depot at Richmond, Virginia, but could not proceed due to lack of transportation as preference was given to the Hampton Legion Battalion Infantry (See the Hampton Legion). The 1st Mississippi Battalion Infantry arrived at Camp Pickens, Manassas Junction, in the evening on 22 July, 1861, and was too late to participate in the first battle of Manassas. Companies G and H arrived at Camp Pickens, Manassas Junction, on 25 and 29 July, 1861, respectively, and Company I on 10 August, 1861. Company K remained at Richmond, Virginia, and arrived at Camp Pickens, Manassas Junction, on 1 September, 1861. Company L was stationed at Richmond, Virginia, and was ordered to Camp Pickens, Manassas Junction, on 19 September, 1861. The 1st Mississippi Battalion Infantry was redesignated the 21st Mississippi Infantry, under the command of Colonel G B Humphreys, in September 1861 and was ordered to Leesburg, Virginia, on 9 November, 1861.

The 21st Mississippi Infantry was assigned to the Seventh Brigade, First Corps, Army of the Potomac, under the command of Colonel N G Evans.