"Frontier Regulars: The United States Army and the Indian, 1866-1890" by Robert Utley is a first edition hardcover book published by Macmillan in 1973. It delves into the historical subject of Americana, specifically exploring the interactions between the US Army and Native American tribes in North America during the late 19th century. Written in English, this original edition offers a unique insight into the complexities of frontier life in the United States.