Buell, several miles behind the action, was unaware that a major battle was taking place and did not send any reserves to the front until late in the afternoon. The Union troops on the left flank, reinforced by two brigades, stabilized their line, and the Confederate attack sputtered to a halt. Later, three Confederate regiments assaulted the Union division on the Springfield Pike but were repulsed and fell back into Perryville. Union troops pursued, and skirmishing occurred in the streets until dark. By that time, Union reinforcements were threatening the Confederate left flank. Bragg, short of men and supplies, withdrew during the night, and continued the Confederate retreat by way of Cumberland Gap into East Tennessee.