The prince took Charbonneau as his companion and they returned to Europe together, where he learned European languages and refinements, before returning to the West again in 1829. He again became a mountain man, trapper and guide, although his unusual background made him a notable anomaly in the Wild West, and in 1847 was appointed alcalde (magistrate) of San Luis Rey Mission in California after guiding the Mormon Battalion there from Leavenworth. He resigned his position on principle over the injustices towards the Native Americans, who were treated as virtual slaves by white landowners. He joined the California Gold Rush, but was unsuccessful in prospecting and died on his way to new gold fields in Montana.