1874 Cavalry Barracks at Fort Laramie. From 1849 to 1890, Fort Laramie served as a principle military post on the Northern Plains. During the Great Sioux War of 1876-77, the fort organized, supplied and coordinated many major campaigns. During that time, Companies I and K, 2nd U.S. Cavalry called this barracks their home. This is just one of the many stories of Fort Laramie- the Crossroads of a ...