Chivington's command, among whom there was a detail of Colorado Mounted Rangers, descended the slope and crept up on the supply train. They waited for an hour in concealment, then attacked, driving off or capturing the small Confederate guard detail without any casualties. Chivington ordered the supply wagons burned, and the horses and mules slaughtered. Meanwhile, the Battle of Glorieta Pass was raging at Pigeon's Ranch. Chivington returned to Slough's main force to find it rapidly falling back. The Confederates had won the Battle of Glorieta Pass, but because of Chivington and his forces, they had no supplies to sustain their advance and were forced to retreat. Chivington had completely reversed the result of the battle. Sibley's men reluctantly retreated back to Texas and never again threatened New Mexico.