The Great Endurance Horse Race of 1908
The 1975 movie, Bite the Bullet, with Gene Hackman, Candice Bergan and James Coburn, was about a 700-mile endurance horse race. The inspiration for the movie was a 600-mile horse race held from Evanston, Wyoming to Denver, Colorado, in 1908. Western author, Jack Schaefer author of Shane and Monte
Source: sheridanmedia.com