In this clip from Return of the Bad Men (1948), good guy vance (played by Randolph Scott) fights the Sundance Kid (Robert Ryan).
Both men were real heroes off-screen as well. Scott served in World War One as an Army Artillery Observer in France, and Ryan served in World War Two as a Marine Corps Drill Instructor. Scott also tried to obtain a Marine Corps commission when World War Two broke out but was rejected due to an old back injury. Still, he went on to tour and raise money for the troops for the duration of the war. And it's noteworthy that both men volunteered to leave their burgeoning film careers to enlist when America called.
Somehow I can't see "stars" like Robert Downey Jr. or Tobey Maguire rushing down to the recruiter's office just because America's at war. But men were really men and Patriotism was the norm back then. Times have certainly changed, haven't they?