Frontier Regulars: The United States Army and the Indian, 1866–1891 by Robert M. Utley is a detailed study of the post–Civil War U.S. Army and its role in the Indian Wars of the late nineteenth century. Utley focuses on the small, professional regular army that remained after the Civil War and was tasked with enforcing federal policy across the vast trans-Mississippi West. Scattered in isolated forts and operating with limited manpower and resources, these soldiers became the principal instrument of American expansion.
The book examines the major campaigns between 1866 and 1891, including conflicts such as Red Cloud's War, the Great Sioux War, the Nez Perce War, and the long-running Apache Wars. Utley analyzes not only battlefield engagements but also the logistical and environmental challenges of frontier campaigning—long supply lines, harsh terrain, unreliable intelligence, and the difficulties of fighting highly mobile Native forces who knew the land intimately.
A central theme of the work is the tension between military strategy and federal Indian policy. Officers in the field often found themselves constrained by shifting directives from Washington, political interference, and the competing agendas of Indian agents, settlers, and railroad interests. Utley shows how the army’s mission evolved from active campaigning to reservation enforcement and suppression of resistance, culminating symbolically in the Wounded Knee Massacre in 1890.
Utley also explores the culture of the frontier officer corps—many of whom were Civil War veterans seeking professional identity in a peacetime army. Figures such as George Armstrong Custer appear not as romantic legends but as products of institutional pressures, ambition, and imperfect intelligence. Rather than glorifying the army, Utley presents it as a flawed but determined organization executing national policy during a period of rapid continental expansion.