over the federal arsenal in San Antonio, with plans to grab the territories of northern New Mexico, Utah, and Colorado, and possibly California. Confederate Arizona was created by Arizona citizens who wanted protection against Apache raids after the United States Army units were moved out. The Confederacy then sets its sight to gain control of the New Mexico Territory. General Henry Hopkins Sibley was tasked for the campaign, and together with his New Mexico Army, marched right up the Rio Grande in an attempt to take the mineral wealth of Colorado as well as California. The First Regiment of Volunteers discovered the rebels, and they immediately warned and joined the Yankees at Fort Union. The Battle of Glorieta Pass soon erupted, and the Union ended the Confederate campaign and the area west of Texas remained in Union hands. Missouri, a Union state where slavery was legal, became a battleground when the pro-secession governor, against the vote of the legislature, led troops to the federal arsenal at St. Louis; he was aided by Confederate forces from Arkansas and Louisiana. However, Union General Samuel Curtis regained St. Louis and all of Missouri for the Union. The state was the scene of numerous raids and guerrilla warfare in the west. Peacekeeping The U.S. Army after 1850 established a series of military posts across the frontier, designed to stop warfare among Native tribes or between Natives and settlers. Throughout the 19th century, Army officers typically built their careers in peacekeeper roles moving from fort to fort until retirement. Actual combat experience was uncommon for any one soldier. The most dramatic conflict was the Sioux war in Minnesota in 1862 when Dakota tribes systematically attacked German farms to drive out the settlers. For several days, Dakota attacks at the Lower Sioux Agency, New Ulm, and Hutchinson killed 300 to 400 white settlers. The state militia fought back and Lincoln sent in federal troops. The ensuing battles at Fort Ridgely, Birch Coulee, Fort Abercrombie, and Wood Lake punctuated a six-week war, which ended in an American victory. The federal government tried 425 Natives for murder, and 303 were convicted and sentenced to death. Lincoln pardoned the majority, but 38 leaders were hanged. The decreased presence of Union troops in the West left behind untrained militias; hostile tribes used the opportunity to attack settlers. The militia struck back hard, most notably by attacking the winter quarters of