James G. Hollandsworth, Jr., "The Louisiana Native Guards" (LSU Press, 1995), pp. 26, 114.

You may be thinking of Francis E. Dumas who served as a Captain and Major in the Louisiana Native Guards. Hollandsworth described him as being the "son of a white Creole father and a mulatto mother" who was educated in France, operated a clothing store in New Orleans, and inherited his father's slaves. He survived the war and became a prominent player in Radical Reconstruction politics in post-war Louisiana.

It has been my understanding that the Louisiana Native Guards were organizaed as part of the Louisiana State Militia, but that they were never transferred into Confederate service.