<Tr> <Th> Box office </Th> <Td> $4.7 million (rentals) </Td> </Tr> <P> Two Mules for Sister Sara is a 1970 American - Mexican western film starring Shirley MacLaine (billed above Clint Eastwood in the film's credits, but not on the poster) set during the French intervention in Mexico . The film was released in 1970 and directed by Don Siegel . It was to have been the first in a five - year exclusive association between Universal Pictures and Sanen Productions of Mexico . The film marked the second of five collaborations between Siegel and Eastwood, following Coogan's Bluff (1968). The collaboration continued with The Beguiled and Dirty Harry (both 1971) and finally Escape from Alcatraz (1979). </P> <P> The plot follows an American mercenary who gets mixed up with a nun and aids a group of Juarista rebels during the puppet reign of Emperor Maximilian in Mexico . The film featured both American and Mexican actors and actresses, including being filmed in the picturesque countryside near Tlayacapan, Morelos . Ennio Morricone composed the film's music . </P> <P> Just after the American Civil War, a former soldier, Hogan, rides up on a naked woman about to be raped by bandits . Hogan kills the bandits, showing not only that he can shoot, but that he is an expert with explosives . He is taken aback when he sees that the woman he has saved is a nun . Sister Sara is raising money to assist Mexican revolutionaries who are fighting the French . When Sara requests that Hogan takes her to a Mexican camp, he agrees because he had previously arranged to help the Mexican revolutionaries attack the French garrison in exchange for half the garrison's treasury, if they are successful . </P>

Where was two mules for sister sarah filmed