American Civil War: Confederate forces defeat Union forces during the Battle of Kennesaw Mountain during the Atlanta Campaign.

The American Civil War was a civil war in the United States between the Union and the Confederacy, which was formed in 1861 by states that had seceded from the Union. The central conflict leading to war was a dispute over whether slavery should be permitted to expand into the western territories, leading to more slave states, or be prohibited from doing so, which many believed would place slavery on a course of ultimate extinction.

The Battle of Kennesaw Mountain was fought on June 27, 1864, during the Atlanta Campaign of the American Civil War. The most significant frontal assault launched by Union Major General William T. Sherman against the Confederate Army of Tennessee under General Joseph E. Johnston, it produced a tactical defeat for the Union forces but failed to deliver the result that the Confederacy desperately needed: a halt to Sherman's advance on Atlanta, Georgia.

The Atlanta campaign was a series of battles fought in the Western Theater of the American Civil War throughout northwest Georgia and the area around Atlanta during the summer of 1864. Union Maj. Gen. William Tecumseh Sherman invaded Georgia from the vicinity of Chattanooga, Tennessee, beginning in May 1864, opposed by the Confederate general Joseph E. Johnston.