The Battle of Chickamauga was fought from September 18 to September 20, 1863, during the American Civil War. It took place in northwestern Georgia and was one of the war's major battles. The conflict involved the Union Army, led by Major General William Rosecrans, and the Confederate Army, commanded by General Braxton Bragg. The battle resulted in a significant victory for the Confederates, forcing the Union forces to retreat to Chattanooga. This battle was notable for being the second deadliest engagement of the Civil War, with around 34,000 casualties. The Union defeat at Chickamauga led to a siege at Chattanooga, which would become a critical point in the war. The battle's outcome had lasting implications for both armies and the overall course of the conflict.