"Not many enlisted men recorded their adventures in Indian warfare. Still fewer actually kept a journal to lend immediacy to their observations. Frontier Soldier is such a journal, by a literate private who left his story of plains warfare in a chronicle rich in detail. It is the richer for the annotations of Jerome A. Greene, whose understanding of the campaigns in which Zimmer marched is surpassed by few historians." --Robert M. Utley, author of Cavalier in Buckskin: George Armstrong Custer and the Western Military Frontier