Dr. Richard Littlebear, a Northern Cheyenne himself, provides an introduction to the 2003 edition of the book.
"This is a special day for all veterans who have passed on, especially here at the battlefield," said Austin Two Moons, a Northern Cheyenne.
After rediscovering his Indian roots, he was enrolled as a member of the Northern Cheyenne in 1980 and was made a chief in 1984.
But the valley is also part of the ancestral homeland of the Northern Cheyenne, whose reservation lies just a few miles to the east.
Ultimately, the military gave up attempting to relocate the Northern Cheyenne in Oklahoma.
In the case of the Northern Cheyenne, the sacred object was a buffalo head.
His efforts to negotiate with the Northern Cheyenne, the Arapaho and other tribes led to a great council at Fort Laramie in 1851.
Eventually the US forced the Northern Cheyenne onto a reservation, in southern Montana.
Against the Northern Cheyennes between 1878 and 1879.
In late February, part of the delegation continued on to find the Northern Cheyenne, where they delivered the same message.