By the middle 1860s, the increasing presence of emigrants and other white settlers in the region began to cause friction with the Lakota and Cheyenne. In response, and partly to protect the new telegraph line, the Army began increasing its presence in the region in 1861 by sending a detachment to guard Guinard's bridge. Many of these troops, who created a series of "stations" along the Oregon trail, were from various state units raised during the Civil War. In 1862 the Army used the buildings at Platte Bridge station while building and occupying Ft. Caspar.