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In roughly that same time period, while General George Armstrong Custer achieved world fame in failure and catastrophe, Mackenzie would become obscure in victory. But it was Mackenzie, not Custer, who would teach the rest of the army how to fight Indians. As he moved his men across the broken, stream-crossed country, past immense herds of buffalo and prairie-dog towns that stretched to the horizon, Colonel Mackenzie did not have a clear idea of what he was doing, where precisely he was going, or how to fight Plains Indians in their homelands. Neither did he have the faintest idea that he would be the one largely responsible for defeating the last of the hostile Indians. He was new to this sort of Indian fighting, and would make many mistakes in the coming weeks. He would learn from them. For now, Mackenzie was the instrument of retribution. He had been dispatched to kill Comanches in their Great Plains fastness because, six years after the end of the Civil War, the western frontier was an open and bleeding wound, a smoking ruin littered with corpses and charred chimneys, a place where anarchy and torture killings had replaced the rule of law, where Indians and especially Comanches raided at will. Victorious in war, unchallenged by foreign foes in North America for the first time in its history, the Union now found itself unable to deal with the handful of remaining Indian tribes that had not been destroyed, assimilated, or forced to retreat meekly onto reservations where they quickly learned the meaning of abject subjugation and starvation. The hostiles were all residents of the Great Plains; all were mounted, well armed, and driven now by a mixture of vengeance and political desperation. They were Comanches, Kiowas, Arapahoes, Cheyennes, and Western Sioux. For Mackenzie on the southern plains, Comanches were the obvious target: No tribe in the history of the Spanish, French, Mexican, Texan, and American occupations of this land had ever caused so much havoc and death. None was even a close second.
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S.C. Gwynne (Empire of the Summer Moon: Quanah Parker and the Rise and Fall of the Comanches, the Most Powerful Indian Tribe in American History)