After Cheyenne takes a cattle herd to Mexico, he is captured by the French. After escaping, he aids a young runaway princess who doesn't like her much older intended husband. He takes her to a rebel camp where they learn her real identity.
Cheyenne is hired to ramrod some cattle south of the border. After completing his task, he is arrested by the French and soon escapes. At about the same time Princess Maria Felitzia arrives in Mexico to marry Gen. Dubeauchaie in an arranged marriage. Her and Baroness Entrada who accompanied her are shocked when they meet the General who is much older and massively obese. Her handmaid Juana is from a local village so the Princess decides the two of them will runaway to her village. With the French soldiers following them she decides they should split up. Cheyenne runs into the Princess who tries to make everyone believe she is a peasant girl named Juanita. He takes her to a rebel camp where he is well known. Her attitude causes Cheyenne and others to call her a princess. The French locate the camp taking the men captive. Cheyenne is recognized and taken to Empress Carlotta who explains who the girl really is. Her identity is soon revealed putting her life in danger and she is caught ... Written by