The Song of the Indian Wars deals with the last great fight for the bison pastures of the Plains between the westering white men and the prairie tribes—the struggle for the right of way between the Missouri River and the Pacific Ocean. Since the period was of of crucial importance in the process of our national development, I have felt the obligation to be accurate. I have neither fictionized my material nor sentimentalized my characters. It seems unnecessary to list all the printed sources upon which I have drawn during the years I have devoted to the subject. The list would be long, and I doubt if any work of considerable significance bearing on the period has escaped me, whether a government report, a formal history or a personal narrative. But one can not safely trust the printed sources alone, and I have made it a duty to consult many veterans who were themselves a part of what I have to tell.