The Ohioans withdrew and were replaced in their position by the 15th Kentucky. As Johnson's men ran low on ammunition, Brig. Gen. Patrick R. Cleburne's brigade entered the battle at about 3:40 p.m. Cleburne's horse, Dixie, was killed by an artillery shell, which also wounded Cleburne in the ankle, but he kept his troops moving forward. As they advanced up the slope, they were subjected to Confederate artillery fire; Cleburne later surmised that the friendly fire was caused by his men wearing blue uniform trousers, which had been captured from Union soldiers at Richmond. On Cleburne's left, Brig. Gen. Daniel W. Adams's brigade joined the attack against the 15th Kentucky, which had been reinforced by three companies of the 3rd Ohio. The Union troops retreated to the west toward the Russell House, McCook's headquarters. Lytle was wounded in the head as he attempted to rally his men. He was left on the field for dead, and was captured.