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September 9, 1863- Chattanooga, Tennessee, is occupied by Union forces under General William Rosecrans whose Army of the Cumberland will soon
invade northern Georgia.
September 19-20, 1863- The Battle of Chickamauga, Georgia. The Union Army of the Cumberland under General William Rosecrans is
defeated and nearly routed by the Confederate Army of Tennessee commanded by General Braxton Bragg. Rosecrans' army retreats to the
supply base at Chattanooga, Tennessee.
September –November 1863-. TheSiege of Chattanooga, Confederate forces under Braxton Bragg surround the occupied city.
General Ulysses S. Grant is assigned to command the troops there and begins immediate plans to relieve the besieged Union army.