Thanks for doing the work involved to produce these references. It's always important to appreciate each for what they really say.

The record from Harper’s Ferry is taken from a Southern newspaper, which makes it much more authoritative than almost anything from a Northern source. The regiment named can be none other than the 4th Alabama Regiment, whose ranks included many slaveholders and sons of slaveholders. The estimated fifty to seventy-five body servants would fit this regiment. If these men really were armed, we would expect them to have been involved in the Battle of Manassas. None of the accounts of the 4th Alabama Regiment mention participation by body servants, nor are any body servants listed among the casualties, which were heavy (almost two hundred killed and wounded).

It's still a good reference. The same is true for the reference to prisoners captured at Rappahannock Station. Teamsters and ambulance drivers are frequently described as being black, so this would fit. It should always be understood that body servants would be found not far from their masters, especially early in the war.

August 3, 1862, Affairs in Tennessee, The Capture of Murfreesboro, The Philidelphia Press of the 19th.
"All who have escaped, and citizens of the place, declare that a battalion of negroes assisted the rebels"

Here's a bogus account taken from a Northern newspaper. We know the exact composition of General Forrest's command at Murfreesboro, and can be certain that no "battalion of negroes assisted the rebels." Sensational accounts like this tend to discredit others that are believable and should be treated seriously.

On a different topic, the State of Louisiana allowed free men of color (Creoles) to serve in their own militia commands. However, "the Regiment of Native Guards, and other organizations of free colored men," never entered Confederate service, nor could they have until March 1865.

The Free Colored Soldiers of Baton Rouge.- The company of free-colored soldiers (citizens of Baton Rouge and vicinity) which we some weeks since announced was being organized under Capt. H. B. Favrot, is at length fully equipped, armed and ready for service. Referring to their first public parade, the Gazette of Tuesday last says:

Capt. H. B. Favrot’s Company- This company made their first appearance in the streets of the city, on Sunday evening last. They are a fine looking band of our free colored friends, whose services have been counted on heretofore, and who are now with us heart and hand, ready to emulate the deeds of their fathers on the plains of Chalmette. As they passed our window, they numbered about sixty, completely equipped, well armed, formidable men. They are an independent company-organized principally for home protection. In sympathy as well as interest, they are with us. Their lives and property, are in the same jeopardy by the invasion with ours, and they will make their mark in case by any possible chance that insolent braggart, Fremont, should succeed in passing the fortifications above, or place the city of New Orleans in jeopardy by landing at the Balize. The men are all known to us, but we are not sufficiently well posted in military matters, to give the names of the officers from their position..

Capt. H. B. bears himself with the same elasticity of step; the same martial air as of old. Indeed, the exigencies of the time have taken the years off his shoulders, when in the by gone time he marched at the head of the invincible Chasseurs. Nine cheers for Capt. H. B. and thrice nine for his gallant company.

This is a great account, lots of detail concerning a militia unit. It would be useful among other authentic accounts of black men enrolled in Southern militia commands. On the other hand, if it falls into the hands of the SCV, they'll have these men fighting in the Hornet's Nest at Shiloh.