The Battle of Peachtree Creek was fought in Georgia on July 20, 1864, as part of the Atlanta Campaign in the American Civil War. It was the first major attack by Lt. Gen. John B. Hood since taking command of the Confederate Army of Tennessee. The attack was against Maj. Gen. William T. Sherman's Union army which was perched on the doorstep of Atlanta. The main armies in the conflict were the Union Army of the Cumberland, commanded by Maj. Gen. George Henry Thomas, and the Confederate Army of Tennessee, commanded by Lt. Gen. John B. Hood. Peachtree Creek was the first battle fought by Hood as commander of the Army of Tennessee.