This was the movie which John Ford remade as his classic My Darling Clementine. Here, Randolph Scott plays Wyatt Earp and Caesar Romero plays Doc Holiday, but there are no Clantons or Earp brothers. Instead, John Carradine plays a bad saloon owner heading a gang that is trying to take over Tombstone.
Of course, this movie can't directly compare to My Darling Clementine, but it's a pretty good western in its own right. Its one of Randolph Scott's better early roles.
Many of the classic scenes in My Darling Clementine were taken directly from this movie, and it's very interesting to compare the two. This version of Frontier Marshal was a remake of an earlier 1933 version, and, of course, this story has been told many times since.
The Maltin Guide gives it three stars. Check it out if you're a western fan, or just a fan of My Darling Clementine.