Book excerpt: Drawing on more than 22 years' research, this book presents an exhaustive chronology of the Great Sioux Campaign in three parts: the U.S. Seventh Cavalry's communications, decisions and movements October 15, 1875-June 21, 1876, are traced day-by-day; the three-day prelude to the Battle of Little Bighorn hour-by-hour; and the battle itself minute-by-minute. The separate actions of the several military commands and the Indians involved are narrated in coherent sequence. Archival intelligence summaries offer the reader fresh perspective on the events leading to the decisive Indian victory known as Custer's Last Stand.