- "A Savage War" (1863): This book provides an account of the Dakota Conflict of 1862 in Minnesota, also known as the Sioux Uprising.
- "The Fighting Bishop: George A. Crooks" (2006): A biography of George A. Crook, a general in the United States Army who played a prominent role in the Indian Wars.
- "Buffalo Bill: William F. Cody and the Wild West" (1999): A biography of William F. Cody, better known as Buffalo Bill, a renowned frontiersman, showman, and entertainer.
- "The Sioux" (2019): A comprehensive history of the Sioux Native American tribes, from their origins to the present day, focusing on their culture, society, and interactions with European settlers and the United States government.
- "The Dakota Conflict: The History of the Minnesota Indian War" (1992): An updated and revised version of "A Savage War," providing a comprehensive account of the conflict between the Dakota people and the United States in Minnesota.
- "Beyond the Mississippi: The Army's Role in the Winning of the West, 1809-1890" (1998): A history of the United States Army's role in the exploration and settlement of the American West
- "The Second Sioux War: The Dakota Uprising of 1862" (2016): A detailed examination of the causes, events, and consequences of the Dakota Conflict, based on in-depth research and primary source material.