William S. Rosecrans in the context of "Battle of Chickamauga"

Georgia was one of the original seven slave states that formed the Confederate States of America in February 1861, triggering the U.S. Civil War. The state governor, Democrat Joseph E. Brown, wanted locally raised troops to be used only for the defense of Georgia, in defiance of Confederate president Jefferson Davis, who wanted to deploy them on other battlefronts. When the Union blockade prevented Georgia from exporting its plentiful cotton in exchange for key imports, Brown ordered farmers to grow food instead, but the breakdown of transport systems led to desperate shortages.

There was not much fighting in Georgia until September 1863, when Confederates under Braxton Bragg defeated William S. Rosecrans at Chickamauga Creek. In May 1864, William T. Sherman started pursuing the Confederates towards Atlanta, which he captured in September, in advance of his March to the Sea. This six-week campaign destroyed much of the civilian infrastructure of Georgia, decisively shortening the war. When news of the march reached Robert E. Lee's army in Virginia, whole Georgian regiments deserted, feeling they were needed at home. The Battle of Columbus, fought on the Georgia-Alabama border on April 16, 1865, is reckoned by some criteria to have been the last battle of the war.

The Chattanooga campaign was a series of maneuvers and battles in October and November 1863, during the American Civil War. Following the defeat of Maj. Gen. William S. Rosecrans's Union Army of the Cumberland at the Battle of Chickamauga in September, the Confederate Army of Tennessee under Gen. Braxton Bragg besieged Rosecrans and his men by occupying key high terrain around Chattanooga, Tennessee. Maj. Gen. Ulysses S. Grant was given command of Union forces in the West which was now consolidated under the Division of the Mississippi. Significant reinforcements also began to arrive with him in Chattanooga from Mississippi and the Eastern Theater. On October 18, Grant removed Rosecrans from command of the Army of the Cumberland and replaced him with Major General George Henry Thomas.

During the opening of a supply line (the "Cracker Line") to feed the starving men and animals in Chattanooga, a force under Maj. Gen. Joseph Hooker fought off a Confederate counterattack at the Battle of Wauhatchie on October 28–29, 1863. On November 23, the Army of the Cumberland advanced from the fortifications around Chattanooga to seize the strategic high ground at Orchard Knob while elements of the Union Army of the Tennessee under Maj. Gen. William Tecumseh Sherman maneuvered to launch a surprise attack against Bragg's right flank on Missionary Ridge. On November 24, Sherman's men crossed the Tennessee River in the morning and then advanced to occupy high ground at the northern end of Missionary Ridge in the afternoon. The same day, a mixed force of almost three divisions under Maj. Gen. Joseph Hooker defeated the Confederates in the Battle of Lookout Mountain. The next day they began a movement toward Bragg's left flank at Rossville.