The 1862 battle of Pea Ridge in northwestern Arkansas was one of the largest Civil War engagements fought on the western frontier, and it dramatically altered the balance of power in the Trans-Mississippi. This study of the battle is based on research in archives from Connecticut to California and includes a pioneering study of the terrain of the sprawling battlefield, as well as an examination of soldiers' personal experiences, the use of Native American troops, and the role of Pea Ridge in regional folklore.