Is that the Wagon Box Fight?
This story is of "The Hayfield Fight" - one day earlier, August 1, 1867 - ninety miles northwest of the Wagon Box Fight. It was three miles from Fort C.F. Smith. The Wagon Box Fight happened on August 2, 1867, within a short distance of Fort Phil Kearny, another fort on the Bozeman Trail.
Wow.....are you a member of the Bozeman Trails Assn? I was for years.