Magnum Force Clint Eastwood Dirty Harry Australian Daybill Poster | Magnum Force is the second to feature Clint Eastwood as maverick cop Harry Callahan after the 1971 film Dirty Harry. Ted Post, who also directed Eastwood in the television series Rawhide and the feature film Hang 'Em High, directed the film, the second in the Dirty Harry series. The screenplay was written by John Milius (who provided an uncredited rewrite for the original film) and Michael Cimino. This film features early appearances by David Soul, Tim Matheson and Robert Urich. At 124 minutes, it is also the longest Dirty Harry film.