Army of the Tennessee

Army of the Tennessee
Unit name	Army of the Tennessee
Dates	1861–1865
Country	United States
Branch	Union Army
Type	Infantry, Cavalry, Artillery
Size	Corps-level army
Notable commanders	Ulysses S. Grant, William T. Sherman, James B. McPherson, John A. Logan

Contents

Army of the Tennessee The Army of the Tennessee served as a principal field force in the American Civil War, operating chiefly in the Western Theater and playing decisive roles at Fort Donelson, Shiloh, Vicksburg Campaign, and the Atlanta Campaign. Under commanders such as Ulysses S. Grant and William T. Sherman, it interacted with formations like the Army of the Ohio, Army of the Cumberland, and Army of the Potomac while facing Confederate opponents including the Army of Mississippi (Confederate), the Army of Tennessee (Confederate), and commanders like Albert Sidney Johnston, P. G. T. Beauregard, and John C. Pemberton.

Formation and Early History

Raised in late 1861 from units previously attached to departments such as the Department of the Tennessee, the force coalesced after operations around Cairo, Illinois, Paducah, Kentucky, and the Mississippi River approaches. Early actions at Fort Henry and Fort Donelson under generals including Ulysses S. Grant and John A. McClernand established reputations later carried into battles like Shiloh (Pittsburg Landing) against the Army of Mississippi (Confederate) led by Albert Sidney Johnston. The army's evolution intersected with political figures such as Abraham Lincoln, strategic thinkers like Winfield Scott, and administrative centers in St. Louis, Missouri and Memphis, Tennessee.

The army operated as a field army comprising multiple corps, divisions, brigades, and batteries, integrating elements from the XVI Corps (Union Army), XV Corps (Union Army), XVII Corps (Union Army), and XIX Corps (Union Army) at different times. Command passed through leaders including Ulysses S. Grant, who promoted subordinates like William T. Sherman, James B. McPherson, John A. Logan, Benjamin M. Prentiss, and Daniel R. Reynolds. Staff officers such as John A. Rawlins, Ordinance Department (Union Army), Quartermaster Department (Union Army), and surgeons tied to the United States Sanitary Commission shaped administrative functions. The army coordinated with naval forces under admirals like David Dixon Porter and Andrew H. Foote during combined operations on the Mississippi River and along the Gulf of Mexico.

The force was central to western campaigns including the Vicksburg Campaign culminating at the surrender of Vicksburg, Mississippi after a siege that involved operations at Jackson, Mississippi, Champion Hill, and Port Gibson. It fought at Shiloh, where clashes with Albert Sidney Johnston and P. G. T. Beauregard tested commanders such as Ulysses S. Grant and William T. Sherman. Later, the army participated in the Chattanooga Campaign at Lookout Mountain and Missionary Ridge against Braxton Bragg, cooperating with the Army of the Cumberland under George H. Thomas and elements of the Army of the Ohio under Ambrose Burnside. During the Atlanta Campaign, the army under William T. Sherman faced Joseph E. Johnston and John Bell Hood, executing flanking maneuvers and sieges culminating in the fall of Atlanta, Georgia. In the March to the Sea and the Carolinas Campaign, troops coordinated scorched-earth operations linked to strategic directives from Abraham Lincoln and policy debates involving figures such as Salmon P. Chase and Edwin M. Stanton.

The army's order of battle changed frequently, incorporating volunteer infantry regiments from states including Ohio, Illinois, Iowa, Wisconsin, Indiana, Missouri, and Michigan, as well as regulars from the United States Regular Army. Cavalry elements included regiments from Illinois Cavalry, Missouri Cavalry, and mounted units attached from the Army of the Potomac in exchanges. Artillery units comprised batteries from the United States Light Artillery, siege artillery organized with assistance from the Ordnance Department (Union Army), and naval artillery in riverine flotillas led by David Dixon Porter. Notable corps commanders such as James B. McPherson, John A. Logan, John McArthur, and division leaders like John A. Logan (again), John M. Palmer, and Morton formed the backbone of tactical leadership alongside brigade commanders like Elias S. Dennis, Elihu B. Washburne, and John A. Logan's contemporaries.

Sustaining operations required coordination with the Quartermaster Department (Union Army), the United States Sanitary Commission, and rail and river networks including the Chicago, Rock Island and Pacific Railroad, Mobile and Ohio Railroad, and the Louisville and Nashville Railroad. Supply depots in Cairo, Illinois, Memphis, Tennessee, and Nashville, Tennessee supported campaigns, while engineering units from the United States Army Corps of Engineers constructed bridges and fortifications at sites like Memphis and Vicksburg. Armaments included rifled muskets such as the Springfield Model 1861, artillery like the 12-pounder Napoleon and Parrott rifle, and naval support provided by ironclads including USS Cairo and USS Carondelet. Medical and administrative care involved surgeons trained under standards advocated by figures like Clara Barton and institutions such as Harvard Medical School alumni serving in military hospitals.

Historians assess the army's impact through studies by scholars working in contexts tied to Civil War historiography, including analyses by Bruce Catton, James M. McPherson, Shelby Foote, and revisionists engaging with archives from the National Archives and Records Administration. The army's campaigns influenced later doctrines studied at institutions like the United States Military Academy and prompted commemorations at battlefields preserved by the National Park Service and organizations such as the American Battlefield Trust. Debates persist over leadership decisions involving Ulysses S. Grant and William T. Sherman, civil-military relations with Abraham Lincoln, and the broader social effects on states including Mississippi, Georgia, and Tennessee. Monuments and museums in locations such as Vicksburg National Military Park and Shiloh National Military Park reflect continuing public interest, while primary documents remain in collections at the Library of Congress, the U.S. Army Military History Institute, and university archives across Ohio, Illinois, and Missouri.

Category:Units and formations of the Union Army