Following Union defeat at the Battle of Chickamauga, Union forces retreated to the railroad junction of Chattanooga, Tennessee. From November 23-25, 1863, Union troops routed the Confederates at the battles of Lookout Mountain and Missionaries Ridge; the victories forces the Confederate troops back into Georgia, ending the siege of Chattanooga and creating the groundwork for Sherman's Atlanta campaign and March to the Sea in 1864.