The Utah Territory during the American Civil War was far from the main operational theaters of war, but still played a role in the disposition of the United States Army, drawing manpower away from the volunteer forces and providing its share of administrative headaches for the Lincoln Administration. Although no battles were fought in the territory, the withdrawal of Union forces at the beginning of the war allowed the Indian tribes to start raiding the trails passing through Utah. As a result, units from California and Utah were assigned to protect against these raids. Mineral deposits found in Utah by California soldiers encouraged the immigration of non-Mormon settlers into Utah.