“Action at Apache Canyon,” by artist Domenick D’Andrea. The National Guard Bureau Heritage Series painting depicts the charge of Apache Canyon, which took place March 26, 1862. It was the first day of the first hostile engagement for the First Colorado Infantry Regiment. These men -- more than a thousand of Colorado Territory's townsmen, farmers, ranchers and miners -- were the state's first Citizen-Soldiers. These ancestors of the modern-day Colorado National Guard carried the fate of the United States in their sights. The charge took place on the first day of the Battle of Glorieta Pass, which lasted through March 28, 1862 and was the battle in which the Coloradoans helped permanently secure the western U.S. for the Union.