Battle during the American Civil War that ended the Confederate siege of Chattanooga. The city had fallen to Union forces on 9 September after a skilful campaign commanded by General William Rosecrans, but he had gone on to defeat at the battle of Chickamauga (19-20 September), just to the south of Chattanooga. A large part of his army had fled back to the town, while General George Thomas had managed to rally enough men to prevent a total rout and had inflicted enough damage on Braxton Bragg's Confederate army to take the shine off the Confederate victory.
In the aftermath of the battle, Rosecrans's army was besieged in Chattanooga. The town is overlooked by mountains, and by occupying Lookout Mountain to the west and Missionary Ridge to the east, Bragg had blocked almost all supply routes into the town. He was convinced that the Union forces in the town would soon be started into surrender.
The Union response to events at Chattanooga was immediate and overwhelming. Even before Chickamauga it had become clear that Rosecrans was vulnerable, and reinforcements were being rushed towards him. General Sherman was ordered to march east from the Mississippi, while another force was dispatched west from the Army of the Potomac and put under the command of Joe Hooker, only recently removed from command of that army.
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