Here are snippets of what I find in the Official Records.

O.R.-- SERIES I--VOLUME 2 [S# 2] -- CHAPTER IX.
JULY 16-22, 1861.--The Bull Run, or Manassas, Campaign, Virginia.
No. 80. -- Organization, at the dates indicated, of the Confederate forces combined at the battle of Manassas, under the command of Brigadier-General Johnston, C. S. Army.

Second Brigade.
Col. F. S. BARTOW.
Seventh Georgia Infantry.
Eighth Georgia Infantry.
Ninth Georgia Infantry.
Duncan's Kentucky Battalion.
Pope's Kentucky Battalion.
Alburtis' Battery.
p. 470

............

JULY 16-22, 1861.--The Bull Run, or Manassas, Campaign, Virginia.
No. 81. -- Reports of General Joseph E. Johnston, commanding Confederate Armies of the Shenandoah and of the Potomac, of operations from May 23 to July 22, with order of battle.

...... In the mean time I waited with General Beauregard near the center the full development of the enemy's designs. About 11 o'clock the violence of the firing on the left indicated a battle, and the march of a large body of troops from the enemy's center towards the conflict was shown by clouds of dust. I was thus convinced that his great effort was to be made with his right. I stated that conviction to General Beauregard, and the absolute necessity of immediately strengthening our left as much as possible. Orders were accordingly at once sent to General Holmes and Colonel Early to move with all speed to the sound of the firing, and to General Bonham to send up two of his regiments and a battery. General Beauregard and I then hurried at a rapid gallop to the scene of action, about four miles off. On the way I directed my chief of artillery, Colonel Pendleton, to follow with his own and Alburtis' batteries.

We came not a moment too soon. The long contest against fivefold odds and heavy losses, especially of field officers, had greatly discouraged the troops of General Bee and Colonel Evans. Our presence with them under fire and some example had the happiest effect on the spirit of the troops. pp. 474/5 .......

.... The order to advance will be given by the commander-in-chief.

VI. Brigadier-General Bee's brigade, supported by Colonel Wilcox's brigade, Colonel Stuart's regiment of cavalry, and the whole of Walton's battery, will form the reserve, and will march via Mitchell's Ford, to be used according to circumstances.

VII. The light batteries will be distributed as follows:
1. To Brigadier-General Ewell's command, Captain Walker's six pieces.
2. To Brigadier-General Jones', Captains Alburtis' and Standard's batteries, eight pieces. p. 480 .....

O.R.-- SERIES I--VOLUME 2 [S# 2] -- CHAPTER IX.
JULY 16-22, 1861.--The Bull Run, or Manassas, Campaign, Virginia.
No. 84. -- Reports of Gen. G. T. Beauregard, C. S. Army, and resulting correspondence.

........ In reply to the play of the enemy's batteries our own artillery had not been either idle or unskillful. The ground occupied by our guns, on a level with that held by the batteries of the enemy, was an open space of limited extent, behind a low undulation just at the eastern verge of the plateau, some live or six hundred yards from the Henry house. Here, as before said, thirteen pieces, mostly 6-pounders, were, maintained in action; the several batteries of Imboden, Stanard, Pendleton (Rockbridge Artillery), and Alburtis, of the Army of the Shenandoah, and five guns of Walton's and Heaton's section of Rogers' battery of the Army of the Potomac, alternating to some extent with each other, and taking part as needed, all from the outset displaying that marvelous capacity of our people as artillerists which has made them, it would appear, at once the terror and the admiration of the enemy.......
p. 494

...... About the time that Elzey and Early were entering into action a column of the enemy (Keyes' brigade, of Tyler's division) made its way across the turnpike between Bull Run and the Robinson house, under cover of a wood and brow of the ridges, apparently to turn my right, but was easily repulsed by a few shots from Latham's battery, now united and placed in position by Capt. D. B. Harris, of the Virginia engineers, whose services during the day became his character as an able, cool, an(. skillful officer, and from Alburtis' battery, opportunely ordered by General Jackson to a position to the right of Latham, on a hill commanding the line of approach of the enemy, and supported by portions of regiments collected together by the staff officers of General Johnston and myself.
pp. 496/7

O.R.-- SERIES I--VOLUME 2 [S# 2] -- CHAPTER IX.
JULY 16-22, 1861.--The Bull Run, or Manassas, Campaign, Virginia.
No. 119. -- Troops of the Army of the Shenandoah engaged in the battle of Manassas.

HEADQUARTERS ARMY OF THE POTOMAC,
August 23, 1861.

(COLONEL: In accordance with your request I send you a list of the regiments actually in the battle of the 21st of July, 1861:

Jackson's Brigade.--Second Regiment. Virginia Volunteers, Col. J. H. Allen commanding; Fourth Regiment Virginia Volunteers, Col. James F. Preston commanding; Fifth Regiment Virginia Volunteers Col. Kenton Harper commanding; Twenty-seventh Virginia Volunteers, Lieutenant-Colonel Echols commanding, Colonel Gordon absent; Thirty-third Regiment Virginia Volunteers, Col. A. C. Cummings commanding.

Under General Bee, consisting of a part of his own and a part of Colonel Bartow's brigade.--Seventh and Eighth Regiments Georgia Volunteers, Bartow's; Second Regiment Mississippi Volunteers, Fourth Regiment Alabama Volunteers, Sixth Regiment North Carolina Volunteers, and two companies Eleventh Mississippi Volunteers, Bee's.
E. K. Smith's brigade.--Colonel Elzey, Tenth Regiment Virginia Volunteers, Third Regiment Tennessee Volunteers, and -- Regiment Maryland Volunteers.

Batteries in action.--Colonel Pendleton's, four pieces; Captain Imboden's four pieces; Captain Alburtis', four pieces; Captain Stanard's, four pieces, and Lieutenant Beckham's, four pieces.
Cavalry.--Col. J. E. B. Smart's, with twelve companies.

I cannot furnish the strength of the regiments, companies, &c.

Respectfully, your obedient servant,
THOMAS G. RHETT.

Assistant Adjutant-General.
Col. THOMAS JORDAN,
Asst. Adjt. Gen., First Corps, Army of the Potomac
pp. 569/70