A train traveling through the Rockies is held up and boarded by two thugs. They rob the wealthy occupants at gunpoint and then make their getaway by handcar.
This one-reel documentary is pretty much what it says in the title. Cavalrymen ride their horses, first over low hedges, then over increasingly rough terrain, until by the end they are sliding down hills to cross a stream and going into caves.
It is a dramatic film, with its colossal explosion and smouldering remains. Within seconds of the chimney's collapse, crowds swarm in to inspect the site; issues of the crowd's health and safety are clearly not a concern, as people smile, wave and salute the camera.
Three young women are smiling and playing in a lake, their nude bodies reflecting in the water, when a forest watcher appears from the wood, and chases them away.