The biggest battle in Georgia, considered a Confederate victory, was the Battle of Chickamauga, fought from September 19 to 20, 1863. It was a significant engagement during the American Civil War, resulting in heavy casualties on both sides but ultimately allowing Confederate forces, led by General Braxton Bragg, to drive back Union forces under General William Rosecrans. Despite this victory, the Confederates were unable to capitalize on their success, leading to the subsequent Siege of Chattanooga.
Confederate victory
gettysburg
The Battle of Antietam was not a clear victory for neither the Confederate nor the Union armies.
the Battle of Chancellorsville
They surrendered
Chickamauga
Chickamauga Creek
The Battle of Chickamauga, September 19-20, 1863.
It was a Union victory, sometimes considered to be a "decisive victory" (meaning it had a major impact on how the war ended).
It was a major victory for the Union and was one of General Grant's early victories.
Confederate victory
When a victory is referred to as Confederate it means the South won the battle.
The highest margin of victory was 36 points when Alabama defeated Georgia, 36-0, in 1905 and 1923.
Union
Chickamauga, just south of Chattanooga, TN, but in Georgia. As usual for Confederates, the Battle of Chickamauga was named after the creek and not a town. The name is Indian for "river of blood".
union
It was a Confederate victory, because the Union garrison packed up and sailed home. It was not strictly a battle. But it was the first time there was any exchange of fire, and four more undecided states opted to join the Confederacy on account of it.