Chickamauga

In 1863, after the Tullahoma Campaign, Union General William Rosecrans renewed his offensive, aiming to force the Confederates out of Chattanooga. In early September, Rosecrans strengthed his forces scattered in Tennessee and Georgia and forced General Braxton Bragg’s army out of Chattanooga, heading south. Bragg was determined to reoccupy Chickamauga because of its manufactures and railroads, and decided to meet a part of Rosecrans’s army, defeat them, and then move back into the city. 

William Rosecrans

Braxton Bragg

On the 17th of September, he headed north, intending to meet and beat the Confederate army. On September 18, 1863, the battle of Chickamauga began. On the 20th, Rosecrans was misinformed that there was a gap in his line. As he fixed the non-existent gap, he created an actual gap. Because of that malfunction, it lead to the victory of the Confederates.

The battle of Chickamauga lead to the Atlanta Campaign because Lincoln's reelection wasn't very promising and because it was a such a major supply line.