Hmmm, what about also the (poss very controversial) following ?
von Trotha in Namibia
John Smith in Virginia against Powhatans, John Mason, John Underhill, Benjamin Church against NE Indians
Sherman and Sheridan against Plains Indians post-ACW
Capt Watkin Tench, Royal Marines, against hostile NSW Aborigines
Jeffrey Amherst against hostile Indians post-1763
KKK leaders against Reconstruction-era Carpetbagger govts and freedmen
FREIKORPS leaders such as Ernst Rohm who suppressed post-WWI SPARTAKIST revolts
BTW, Tarleton's 1st name is spelled Banastre, and his success as a counter-revolutionary could be questioned, since his indiscriminate brutality against both loyalist and neutralist ppl in the SC backcountry alienated previously uncommitted Americans into supporting the Rebel cause (as portrayed in THE PATRIOT with the fictional Col. Tavington).