Between September 19 and 20, 1863. Union and Confederate forces, including the Army of Tennessee, engaged in bloody combat near Chickamauga in Northern Georgia. The Confederates emerged victorious, which boosted morale. However, the army suffered almost 18,500 casualties, including 2,312 deaths.
Officers Polk, Longstreet, and Hill began secret talks to oust Bragg in late September. On October 4, Longstreet and Hill along with 11 other officers signed a petition that falsely claimed Bragg was suffering from ill health. Polk was not present because Bragg had had him placed under arrest for defying orders and failing to attack at dawn September 20 in Alabama. News of the cabal spread to army headquarters, and Bragg was dismayed to hear that some officers he recommended for corps command were conspiring against him. President Jefferson Davis arrived in Georgia to meet with Bragg and his opponents to hear their grievances. Eventually, he declared that Bragg was still worthy of his position as General. Officers hostile to Bragg, including Hill and Polk, were given positions outside the Army of Tennessee.