From the The War of the Rebellion:
A Compilation of the Official Records
Of Union and Confederate Armies:

August 1861, Series I, Volume IV Colonel John W. Phelps (1st Vermont Infantry) They—the enemy—talked of having 9,000 men. They had twenty pieces of artillery, among which was the Richmond Howitzer Battery, manned by Negroes.
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May 1862, Series I, Volume XIV Colonel Benjamin C. Christ (50th Regiment Pennsylvania Volunteers) There were six companies of mounted riflemen, besides infantry, among which were a considerable number of colored men."
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July 1862, Series I, Volume XVI, Lieutenant Colonel John G. Parkhurst (9th Michigan Infantry) There were also quite a number of negroes attached to the Texas and Georgia troops, who were armed and equipped, and took part in the several engagements with my forces during the day.
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July 1862 Series III, Volume II Richard Yates, Governor of Illinois. Excerpt from a Letter to President Abraham Lincoln:
They [CSA] arm Negroes and merciless savages in their behalf. Mr. Lincoln, the crisis demands greater efforts and sterner measures.
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Sept. 1862 Series I, Volume XV Major Frederick Frye (9th Regiment Connecticut Volunteers) Pickets were thrown out that night, and Captain Hennessy, Company E, of the Ninth Connecticut, having been sent out with his company, captured a colored rebel scout, well mounted, who had been sent out to watch our movements."
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Sept. 1862 Series I, Volume XIII Major General Samuel R. Curtis (2nd Iowa Infantry) We are not likely to use one negro where the rebels have used a thousand. When I left Arkansas they were still enrolling Negroes to fortify the rebellion.
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Oct. 1862 Series I, Volume XIX, Part I-Reports Lieutenant Colonel Stephen Wheeler Downey (3rd Maryland Infantry, Potomac Home Brigade) Question by the Judge Advocate.: Do you know of any individual of the enemy having been killed or wounded during the siege of Harpers Ferry?
Answer. I have strong reasons to believe that there was a negro killed, who had wounded 2 or 3 of my men. I know that an officer took deliberate aim at him, and he fell over. He was one of the skirmishers of the enemy, and wounded 3 of my men. I know there must have been some of the enemy killed.
Question. How do you know the Negro was killed?
Answer. The officer saw him fall.
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Jan. 1863 Series I, Volume XVII Brigadier General D. Stuart (U.S. Army 4th Brigade and Second Division) I t had to be prosecuted under the fire of the enemy's sharpshooters, protected as well as the men might be by our skirmishers on the bank, who were ordered to keep up so vigorous a fire that the enemy should not dare to lift their heads above their rifle-pits; but the enemy, and especially their armed negroes, did dare to rise and fire, and did serious execution upon our men.
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June 1863 Series II, Volume VI Lieutenant-Colonel William H Ludlow (Agent for Exchange of Prisoners / 73rd New York Volunteer Infantry) And more recently the Confederate legislature of Tennessee have passed an act forcing into their military service (I quote literally) all male free persons of color between the ages of fifteen and fifty, or such number as may be necessary, who may be sound in body and capable of actual service; and they further enacted that in the event a sufficient number of free persons of color to meet the wants of the State shall not tender their services, then the Governor is empowered through the sheriff's of different counties to impress such persons until the required number is obtained.
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September 1863 Series III, Volume III Thomas H. Hicks (United States Senator, Maryland) Excerpt from a Letter to President Abraham Lincoln:
I do and have believed that we ought to use the colored people, after the rebels commenced to use them against us.
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Aug. 1864 Series I, Volume XXXV, Part I, Reports, Correspondence, etc. Brigadier General Alexander Asboth (U.S. Army, District of West Florida) We pursued them closely for 7 miles, and captured 4 privates of Goldsby's company and 3 colored men, mounted and armed, with 7 horses and 5 mules with equipments, and 20 Austrian rifles
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Nov. 1864 Series I, Volume XLI, Part IV, Captain P. L. Powers (47th Missouri Infantry, Company H) Correspondence, Etc. Series I, We have turned up eleven bushwhackers to date and one rebel negro.
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April 1865 Series I, Volume XLIX, Part II Major A. M. Jackson (10th U. S. Colored Heavy Artillery) The rebels are recruiting negro troops at Enterprise, Mississippi, and the negroes are all enrolled in the State.

After the action at Missionary Ridge, Commissary Sergeant William F. Ruby forwarded a casualty list written in camp at Ringgold, Georgia about 29 November 1863, to William S. Lingle for publication. Ruby's letter was partially reprinted in the Lafayette (Missouri) Daily Courier for 8 December 1863: "Ruby says among the rebel dead in the [Missionary] Ridge he saw a number of Negroes in the Confederate uniform."

William F. Ruby
Residence Tippecanoe County IN;
Enlisted on 9/18/1861 as a Private.

On 9/18/1861 he mustered into "E" Co. IN 10th Infantry
He was Mustered Out on 9/19/1864 at Indianapolis, IN

Promotions:
* Comm Sergt 3/20/1863 (Estimated day)

Intra Regimental Company Transfers:
* 3/20/1863 from company E to Field & Staff (Estimated Day)