protect immigrants crossing the Great Plains and a series of posts in California protected miners. Forts were constructed to launch attacks against the Sioux. As Indian reservations sprang up, the military set up forts to protect them. Forts also guarded the Union Pacific and other rail lines. Other important forts were Fort Sill, Oklahoma, Fort Smith, Arkansas, Fort Snelling, Minnesota, Fort Union, New Mexico, Fort Worth, Texas, and Fort Walla Walla in Washington. Fort Omaha, Nebraska, was home to the Department of the Platte, and was responsible for outfitting most Western posts for more than 20 years after its founding in the late 1870s. Fort Huachuca in Arizona was also originally a frontier post and is still in use by the United States Army. Indian reservations Settlers on their way overland to Oregon and California became targets of Native threats. Robert L. Munkres read 66 diaries of parties traveling the Oregon Trail between 1834 and 1860 to estimate the actual dangers they faced from Native attacks in Nebraska and Wyoming. The vast majority of diarists reported no armed attacks at all. However many did report harassment by Natives who begged or demanded tolls, and stole horses and cattle. Madsen reports that the Shoshoni and Bannock tribes north and west of Utah were more aggressive toward wagon trains. The federal government attempted to reduce tensions and create new tribal boundaries in the Great Plains with two new treaties in early 1850, The Treaty of Fort Laramie established tribal zones for the Sioux, Cheyennes, Arapahos, Crows, and others, and allowed for the building of roads and posts across the tribal lands. A second treaty secured safe passage along the Santa Fe Trail for wagon trains. In return, the tribes would receive, for ten years, annual compensation for damages caused by migrants. The Kansas and Nebraska territories also became contentious areas as the federal government sought those lands for the future transcontinental railroad. In the Far West settlers began to occupy land in Oregon and California before the federal government secured title from the native tribes, causing considerable friction. In Utah, the Mormons also moved in before federal ownership was obtained. A new policy of establishing reservations came gradually into shape after the boundaries of the "Indian Territory" began to be ignored. In providing for Indian reservations, Congress and the Office of Indian Affairs hoped to de-tribalize Native Americans and prepare them for