Dodge City is a 1939 Western film directed by Michael Curtiz and starring Errol Flynn, Olivia de Havilland, Alan Hale, Bruce Cabot, Ann Sheridan and Henry Travers.
It was at youtube for a short while but is no longer.
There's a version dubbed in German here, but that isn't quite the same.
Slant Magazine calls it "a well-crafted and perfectly capable western". DVD Talk calls it "a pleasant enough westerm with few surprises". Everybody seems to agree that Flynn is misplaced as a wild west sheriff.