Sounds plausible; but be careful not mixing these up:

Robt A Hart, Col-30th Ark

Major Hart-QM in Texas engaged in trading cotton for arms and other supplies

Here is another entry for R A Hart

Fold 3 CSRs
R A Hart, Major & ADC
8/1/62-8/15/62 Mileage paid for traveling from Little Rock to Batesville and back. To inspect Gen McBride's command and mustering companies not already mustered.
You will organize and cause to be reported to Gen McBride all unattached companies dismounting them, if mounted provided Gen McBride deems it expedient. You will confer with him as to the best means of increasing the strength and efficiency of his command. R C Newton, AAG