This is a follow up (but not a sequel) to Dodge City (1939). That movie had ended with Errol Flynn and Olivia de Havilland's characters leaving for Virginia City. Next year, the director Michael Curtiz and leading actor Errol Flynn are back together to film Virginia City, but the characters are different and de Havilland has been replaced by Miriam Hopkins.
This movie, unlike Dodge City, is black & white, but it does have stunning cinematography, with exteriors filmed in Painted Desert among other places. I thought it had a very good story, only slightly spoiled by a corny ending. It is a western and also a spy story, with a union agent (Errol Flynn) and a confederate one (Randolph Scott), who have a history together, competing to get the gold that was meant to help the Confederacy maintain the war effort.
Flynn and Scott did a good job. As in Dodge City, Flynn does not completely convince me as a cowboy. He is a bit too refined for that. But he has such a great camera presence that I don't mind. That guy was born to be a movie star. Hopkins is fine, but she is no de Havilland, and her singing scenes in the saloon are just OK. Then we have Bogart as the evil outlaw who is also after the gold. Much as I like Bogart, he is kind of ridiculous here, between that moustache and the weird accent. I liked him much better as a western villain in The Oklahoma Kid, where he was suitably menacing.
All in all, a very entertaining story. That ending could have been polished a bit more, though.