The origin of the Army of the Cumberland dates back to the creation of the
Army of the Ohio in November 1861, under the command of
Brig. Gen. Robert Anderson. The army fought under the name Army of the Ohio until
Maj. Gen. William S. Rosecrans assumed command of the army and the
Department of the Cumberland and changed the name of the combined entity to the Army of the Cumberland. When Rosecrans assumed command, the army and the
XIV Corps were the same unit, divided into three "grand divisions" (wings) commanded by
Alexander McCook (right wing),
George H. Thomas (Center), and
Thomas L. Crittenden (Left). General Order No. 168 was the order passed by the Union Army on October 24, 1862, that called for commissioning the
XIV Corps into the Army of the Cumberland. The army's first significant combat under the Cumberland name was at the
Battle of Stones River. After the battle the army and XIV Corps were separated. The former Center wing became XIV Corps, the Right wing became
XX Corps, and the Left wing became
XXI Corps. Rosecrans still retained command of the army. He next led it through the
Tullahoma Campaign and at the
Battle of Chickamauga, after which the army became besieged at
Chattanooga. Maj. Gen.
Ulysses S. Grant arrived at Chattanooga. Reinforcements from the
Army of the Potomac and the
Army of the Tennessee also arrived. Rosecrans had been a popular and respected commander, but because of his defeat at Chickamauga and inability to lift the
Confederate siege, Grant chose to replace him with
George H. Thomas on October 19, 1863. In the
Battles for Chattanooga, Grant had been leery of using the Army of the Cumberland in the main fighting, fearing their morale to be too low after the defeat at Chickamauga. Instead, he used the veterans from the Army of the Potomac, proud of their recent victory at the
Battle of Gettysburg, to take
Lookout Mountain and planned to use the troops from the
Army of the Tennessee, also recent victors at the
Siege of Vicksburg, to attack the Confederate right flank on
Missionary Ridge. The Army of the Cumberland was given the minor task of seizing the rifle pits at the base of Missionary Ridge. However, once they achieved their objective, four divisions (one led by
Philip H. Sheridan) stormed up the ridge and routed the Confederate center. When Grant angrily asked who had ordered those troops up the ridge both Thomas and
Gordon Granger, a corps commander in the army, responded they did not know. Granger then added, "Once those boys get started, all hell can't stop 'em." After Grant's victory at Chattanooga earned him promotion to general-in-chief of the U.S. Army, Maj. Gen.
William T. Sherman assumed command of Grant's
Military Division of the Mississippi, which controlled all
Union armies in the West. He created an "army group" of the Army of the Cumberland, the
Army of the Tennessee, and the
Army of the Ohio and
marched towards Atlanta in May 1864. On the way to Atlanta they fought in many battles and skirmishes including the
Battle of Kennesaw Mountain. In September, Atlanta fell to Sherman's army group. When Confederate general
John B. Hood moved north from Atlanta, Sherman chose not to follow him and instead dispatched some of the Army of the Cumberland (IV Corps and Provisional Detachment) and the Army of the Ohio (
XXIII Corps) after him. Thomas finally met Hood at the
Battle of Nashville and crushed him, thus bringing to an end any significant military actions for the Army of the Cumberland. Other elements of the Army of the Cumberland (the XIV and XX Corps) marched to the sea and north through the Carolinas with Sherman, under the command of Maj. Gen.
Henry W. Slocum. These forces became the Union's
Army of Georgia and participated in the
Grand Review of the Armies in
Washington, D.C., before President
Andrew Johnson in 1865. ==Command history==