The Confederates, however, believed that opening a route to California would aid their cause. In summer 1861, John R. Baylor led the Confederates into Mesilla and declared the southern portion of New Mexico as the Confederate Territory of Arizona. He then marched into Tucson and declared Southern Arizona the second district of the Arizona Territory. In response to this aggression, President Abraham Lincoln appointed Henry Connelly - an Anglo politician who married into a Mexican American family - as the territorial governor of New Mexico. Inspiring confidence amongst the Nuevomexicanos, the Union army was soon filled by Mexican Americans. The New Mexico units, known as the New Mexico Volunteers, were led by Brigadier General Diego Archuleta, Lt. Col. Manuel Chávez, Lt. Col. Francisco Perea, Col. José Guadalupe Gallegos, J. Francisco Chaves, and Cpt. Rafael Chacón. This massive Mexican American army was able to destroy the Confederate hold on New Mexico by March 28, 1862, when Lt. Col. Manuel Chávez and his troops destroyed the Confederate supply train on Glorieta Pass and forced the Confederate soldiers to abandon the field. Often called the "Gettysburg of the West," the Battle of Glorieta Pass effectively ended the Confederates attempts to take over the Western United States. With the Confederates’ surrender of the Territory, Mexican Americans from California were responsible for clearing out all Confederates supporters, including French imperialists who entered the U.S. during Maximilian’s rule in Mexico.