You got me confused a bit. The Five Civilized Tribes fought prominently (on both sides) in the CW, most notably under the command of Brig. General Stand Watie, CSA, the last commander to surrender forces in June 1865. However, I must agree about General Lee and Grant. No doubt U.S. Grant was the only general to kill more yankee soldiers than General Lee and for that accomplishment (along with defeating the outnumbered ANV), he won respect of millions and got elected POTUS.
Joe