Why did the battle of chickamauga start?

The Battle of Chickamauga began as part of the Confederate campaign to regain control of Chattanooga, Tennessee, a vital logistical hub during the American Civil War. Following the Union's victory at the Battle of Davis's Cross Roads, Confederate General Braxton Bragg sought to confront Union forces led by General William Rosecrans, who were advancing into Georgia. The battle commenced on September 19, 1863, when Confederate forces attacked the Union army, leading to one of the war's bloodiest engagements. The clash was fueled by strategic objectives and the desire to control key supply lines in the region.