Six Guns by Chet Cunningham
They were just boys, but a thirst for revenge made them men.
Six years before, the able troop of the Fourteenth Cavalry Regiment had been assigned to escort a small tribe of Comanche to a reservation. Instead they went on a brutal rampage, killing almost every man, woman and child in the camp. But one miraculously survived the the massacre. A twelve year old boy called Eagle. Now he was eighteen and revenge burned in his gut like a hot poker. He wouldn't rest until every last member of the regiment died screaming.