A Horseman in the Sky. Ambrose BierceIn this Civil War story, Carter Druse, a young soldier from a wealthy Virginia family elects to fight for the Union. We find him posted on sentry duty, guarding the valley where five regiments of Union soldiers are hunkered down and hiding. Carter′s orders are to prevent a rebel scout from discovering their whereabouts. How far would you go to fulfill your mission? This story was first published in the San Francisco Examiner on April 14, 1889. We offer a useful A Horseman in the Sky Study Guide for students and teachers.