Third Battle Of Chattanooga

On November 23, 1863, the Battle of Chattanooga began. Over the next three days, Union forces drove Confederate troops away from Chattanooga, Tennessee, into Georgia, setting the stage for Union General William T. Sherman's triumphant march to the sea.

The Battle of Chattanooga was one of the most dramatic turnabouts in American military history. Northern forces captured the steamboat and railhead center shortly after their September defeat at Chickamauga. In the early fall of 1863, Rebel forces moved into the mountains and bluffs overlooking Chattanooga, preventing the Union Army's escape.

http://memory.loc.gov/ammem/today/nov23.html