Hello Sharon and Tony,

There seems to be a heated debate over Black Confederates.Yes ,they did fight and is documented.Please check the following sources :
Blacks in Blue and Gray(One of the best source and written by a black )
By H.C. Blackerby
Portals Press
Tuscaloosa,Alabama
Copyright 1979

Black Southerners in Gray
By Andrew Chandler Battaile
Southern Heritage Press
Copyright 1994

Berdan's U.S. Sharpshooters in the Army of the Potomac 1861-1865
By C.A. Stevens
Price McDill Co.Inc.
Copyright 1892(mentions unit being pick off by Black Confederate sharpshooter)