Fleeing westward, Langdon and Marriner stop in a backwoods tavern, where they help a man in a green uniform. After a night of drinking "Flip" - similar to hot buttered rum - the two men wake up at Fort Crown Point, where they learn the man they met is Major Robert Rogers (Spencer Tracy), commander of Rogers' Rangers. In need of Langdon's map-making skills, Rogers recruits the two men for his latest expedition to destroy the hostile Abenakis tribe and their town of St. Francis far to the north, several miles north of New Hampshire's northernmost border.