John Wayne stars as Lt. Col. Kirby Yorke, whose devotion to duty has cost him his marriage to his beloved Kathleen (Maureen O'Hara). Yorke gets word that his son, Jeff (Claude Jarman Jr.) -- whom he hasn't seen in 15 years -- has been dropped as a cadet from West Point, and that he lied about his age to enlist in the cavalry, in an effort to redeem himself.