From The Earth Is Weeping: The Epic Story of the Indian Wars for the American West, by Peter Cozzens (Knopf, 2016), Kindle Loc. 1565-1570, 2266-2281:
The only force that had proven able to best the Oglalas and the Cheyennes was Major Frank North’s Pawnee Battalion. North’s command was an experiment in recruiting friendly Indians as soldiers that paid handsome dividends. Uniformed in regulation blue and well armed, the two hundred warriors of the Pawnee Battalion protected Union Pacific work crews far more effectively than the army. They marched and drilled as cavalry but fought in the loose formations of Plains warriors. In early August, a Pawnee company attacked a large Cheyenne war party that was plundering a derailed freight train, killing by North’s estimate seventeen warriors. Cheyenne sources disputed the numbers, but the blow kept their war parties away from the railroad.
The Pawnees did most of the killing at Summit Springs, and they killed without mercy. The Cheyennes expected as much. “I do not belittle the Pawnees for their killing of women or children because as far back as any of us could remember the Cheyenne and Sioux slaughtered every male, female, and child they could run across of the Pawnee tribe,” said a Dog Soldier survivor. “Each tribe hated the other with a deadly passion and savage hearts [that] know only total war.” Sherman and Sheridan’s notion of total war paled beside that of the Plains Indians.
Carr achieved complete victory at Summit Springs. He reported fifty-two Cheyennes killed (sexes and ages unspecified), an unknown number wounded, and seventeen women and children captured. No soldiers died, and only one was wounded, barely scratched by an arrow. Carr burned eighty-six lodges and captured 450 ponies. Remnants of Tall Bull’s village reached the Lakota camps in the Black Hills, but the Dog Soldiers as a band had ceased to exist. In those twenty terrifying minutes at Summit Springs, their world ended. For all their truculence, the Dog Soldiers had not sought war with the whites. Tall Bull had spoken truthfully when he told General Hancock in 1867 that the Dog Soldiers wanted only to live unmolested in their Republican River home. When the Union Pacific Railroad began its inexorable way toward their country, bringing thousands of settlers and driving off the buffalo, the Dog Soldiers had fought to save their country and their way of life the only way they knew how—with horrific raids calculated to terrorize the whites into keeping away. Few whites understood the Dog Soldiers’ behavior, and fewer still could excuse the atrocities. The Dog Soldiers were likewise unable to comprehend the social and economic forces that impelled the whites to take their country. Nevertheless, it was a brutal fate that decreed the Dog Soldiers’ annihilation after they had given up the struggle.