Are you getting Hawthorne/Cocke's 39th mixed up with Hart/McNeils/Rogan's 39th that later became the 30th? At Prairie Grove Hawthorne's 39th/6th Trans Miss was in Fagan's, as well as at Helena part of Fagan's. During the Red River expedition and the Camden Campaign battles it was in Hawthorne's brigade of Churchill's Div. Hawthorne's regiment never served under McRae in a brigade that I am aware of unless for some reason at the fall of Little Rock, which I can't seem to locat an order of battle on at the moment.