Hi Bob,
In the Alexander Papers, Special Orders #23 has the following on July 4, 1862:

2nd Nelsons brigade will consist of:
Nelson's Regt Texas Infy
Pleasant's Regt Ark Infy
Johnson's Regt Ark Infy
Morgan's Battn Ark Infy
Wheat's Battn Ark Cav
Daniels' Texas Battery
and all other forces between the Arkansas and Mississippi Rivers and south of the Memphis-Little Rock Railroad