 Union troops re-captured the territory in early 1862, forcing the Confederates to retreat following the Battle of Glorieta Pass in March.Confederate troops withdrew because a detachment of the 1st Colorado Infantry under Major John M. Chivington burned their supply train.Despite the Union regulars, 1st Colorado Infantry, and New Mexican Volunteers being defeated on the battlefield, they ultimately won the campaign; the battle was one of several later dubbed the "Gettysburg of the West".