Chief Red Cloud redoubled his efforts in the spring of 1867 against the three northern forts and travel on the Bozeman Trail was all but cut off. For over a year the southern forts had scarcely any communication from Fort C.F. Smith (1) except from one band of Crows that reported all was well.
As a result of the military reversals and increasing pressure from the Indians under Red Cloud the U.S. Government capitulated and negotiated the 1868 Treaty of Fort Laramie, which resulted in the abandonment of the three northern forts (Fort Reno (2), Fort Phil Kearny, and Fort C.F. Smith (1)) and the cessation of travel on the Bozeman Trail. The Sioux Indians destroyed the three forts immediately after the troops had left the country.