28 March 1862 — New Mexico
After some fighting on 26 March between another Union officer and the Confederates, Colonel Slough arrived with 900 Coloradans to join the renewed fighting at Glorieta Pass, New Mexico, on the 28th (making the Union count about 1,300 and the Confederates 1,100). After a day of fighting, the Union troops had fallen back and it appeared that the Confederates had won. However, during the battle some Union troops had destroyed the Confederate supply train, forcing the Confederates to withdraw to Santa Fe and eventually San Antonio and making it a significant victory for the Union. After the battle, Slough left for the East, where he was appointed brigadier general of volunteers and military governor of Alexandria, Virginia.