Two Mules for Sister Sara (1970)

IMDB
Genre : Adventure, Drama, Romance
TRAILER
Director : Don Siegel
Stars : Shirley MacLaine, Clint Eastwood, Manolo Fábregas, Alberto Morin
Plot : Nun Sara (Shirley MacLaine) is on the run in Mexico and is saved from cowboys by Hogan (Clint Eastwood), who is preparing for a future mission to capture a French fort. The pair become good friends, but Sara never does tell him the true reason behind her being outlawed.