Volume X of the ORs focuses on operations in Kentucky, Tennessee, North Mississippi, North Alabama, and Southwest Virginia for the period March 4–June 10, 1862. It begins with General G.T. Beauregard assuming command of the Confederate Army of the Mississippi, and includes the Battle of Shiloh (April 6–7) and the siege of Corinth (April 29–June 10). Colloquially known as "The Official Records of the War of the Rebellion," or often simply the Official Records or ORs, the full 129-volume series is an unparalleled work of collaborative national history and a primary resource for all Civil War histories. The U.S. government began collecting its own documents—military orders, reports, correspondence, and maps—before the war's end, and the Government Printing Office began publishing the series in the 1880s. This edition was originally issued by the National Historical Society press in 1971 and reprinted in 1985.