The Battle of Chickamauga, fought September 18–20, 1863, occurred as the culmination of the Chickamauga Campaign in southeastern Tennessee and northwestern Georgia. Union Maj. Gen. William Rosecrans, following his successful Tullahoma Campaign, renewed the offensive with the objective of forcing Confederate forces out of Chattanooga. In early September, Rosecrans consolidated his scattered forces across Tennessee and Georgia and successfully pushed Bragg's army out of Chattanooga, setting the stage for the engagement at Chickamauga Creek.
The battle pitted the U.S. Army's Army of the Cumberland under Maj. Gen. William Rosecrans against the Confederate Army of Tennessee commanded by Gen. Braxton Bragg. The engagement was named for Chickamauga Creek, with the West Chickamauga Creek meandering near and forming the southeast boundary of the battle area in northwest Georgia.
The Battle of Chickamauga held profound historical significance as the first major battle of the war fought in Georgia and the most significant Union defeat in the Western Theater. In terms of casualties, it involved the second-highest number of casualties of any battle in the war, surpassed only by the Battle of Gettysburg. The battle marked the end of the U.S. Army offensive that had characterized the Chickamauga Campaign and represented a major turning point in the Western Theater of the Civil War.
The American Civil War (1861–1865) was the deadliest conflict in American history, killing an estimated 620,000 to 750,000 soldiers and an unknown number of civilians. The Confederate States of America, formed by eleven seceding Southern states, faced the Union in four years of warfare across 23 states and territories. Major engagements included First and Second Bull Run, Antietam (the bloodiest single day in American history, September 17, 1862), Chancellorsville, Gettysburg (July 1–3, 1863), Vicksburg (surrendered July 4, 1863), and Sherman's March through Georgia and the Carolinas (1864–1865). President Lincoln issued the Emancipation Proclamation on January 1, 1863, transforming the war's stated purpose to include the abolition of slavery and enabling the enlistment of approximately 180,000 Black men in the United States Colored Troops. Confederate General Robert E. Lee surrendered to Ulysses S. Grant at Appomattox Court House on April 9, 1865. The war resolved the question of secession and ended American slavery, though Reconstruction would face sustained resistance in its attempt to secure civil rights for formerly enslaved people.
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