Breakheart Pass is a 1975 American Western film that stars Charles Bronson, Ben Johnson, Richard Crenna, and Jill Ireland. Based on the 1974 novel of the same title by Scottish author Alistair MacLean (1922–1987), it was filmed in north central Idaho. Plot In the 1870s, residents of the garrison at the Fort Humboldt frontier outpost of the United States Army are reported to be suffering from a diphtheria epidemic. A special express train is heading up into the remote mountain ranges towards the fort filled with reinforcements and medical supplies. There are also civilian passengers on the train in the rear luxurious private car – Nevada Governor Fairchild (Richard Crenna) and his fiancée Marica (Jill Ireland), the daughter of the fort's commander. The train stops briefly in the small whistle stop settlement of Myrtle, where it takes on board local lawman United States Marshal Pearce (Ben Johnson) and his prisoner, John Deakin (Charles Bronson), a supposedly notorious outlaw who was identified via a picture in a newspaper advertisement offering a $2,000 (approximately $ today) reward. But as the journey goes on through the beautiful snowy mountain scenery, several train passengers, including most of the train's soldier escort, are mysteriously killed or go missing. Deakin, who is actually an undercover U.S. Secret Service agent, uncovers en route that the "epidemic" at the outpost is actually a conspiracy between a group of killers led by the notorious outlaw Levi Calhoun (Robert Tessier), and a tribe of Indians under Chief White Hand (Eddie Little Sky). Instead of medical supplies, the train's boxcars are transporting a large secret shipment of weapons, rifles, ammunition and dynamite stolen from U.S. arms manufacturers for sale to the Indians, in return for allowing Calhoun and his men to mine and smuggle gold from their lands. Most of the people on the train, including Governor Fairchild and Marshal Pearce, are Calhoun's partners in crime, and those innocents who discover the evidence for his sinister plot are eliminated. Eventually, Deakin narrows his list of possible uninvolved allies down to Marica and Army Major Claremont (Ed Lauter), who agrees to assist the agent in his efforts to prevent the arms delivery. At snow-covered Breakheart Pass, all hell breaks loose as Indians attack the train to take the weapons they were promised, and Calhoun and his men ride out to the train in order to find out what is going on. Deakin