http://www.imdb.com/title/tt0031346/I just saw "Frontier Marshal" (1939) on Fox Movie Channel. I'd give it 7/10
As a movie, it is an enjoyable watch, but (surprise surprise!) it bears just about zero resemblance whatsoever to the true story of Wyatt, Doc, and the Gunfight at OK Corral.
Yes, I have seen "My Darling Clementine," "Gunfight at the OK Corral," "Hour of the Gun," "Tombstone," and "Wyatt Earp"; but "Frontier Marshal" is so wildly inaccurate, it makes the others seem like documentaries.
This movie was directed by Allan Dwan, and produced by Sol M. Wurtzel. (Wurtzel also produced a 1934 movie called "Frontier Marshal," which was directed by Lewis Seiler; the main character's name is "Michael Wyatt."
http://www.imdb.com/title/tt0025144/According to Wikipedia, both films were "based on Stuart N. Lake's enormously popular but highly fictitious "biography of Wyatt Earp, [entitled] Wyatt Earp; Frontier Marshall." I have not seen the 1934 version).
Randolph Scott plays Earp, and Cesar Romero plays Doc (whose last name in this movie is "Halliday.") Their performances are OK, but nothing spectacular. Romero's is probably my least favorite film portrayal of Doc. This is not meant as a criticism of Romero's performance, as much as a comment on the incredible Doc performances by Mature, Douglas, Robards, Kilmer, and Quaid.
Scott's performance as Earp is not as good as the performances by Fonda, Lancaster, or Garner. Again, this is more of a comment on the great performances by Fonda, Lancaster, and Garner, than a criticism of Scott's performance. (I don't care much for the Earp performances by Kurt Russell or Kevin Costner ).
Nancy Kelly and Binnie Barnes deliver very good performances as "Sarah Allen" and "Jerry," who are the equivalent characters to "Clementine Carter" and "Chihuahua" in "My Darling Clementine.")
It's funny to see Ward Bond as a very young-looking mayor.
Much of the plot is very similar to that of "My Darling Clementine," which was released 7 years later, in 1946. (I am not sure if it's because Ford copied some of his plot lines from this movie, or it's just that both films are based on the same book; I'd guess it's the latter, though I have not read the book. I'm not much into reading fiction

But this movie is FAR less accurate than even "My Darling Clementine." I watched this movie purely as a work of fiction, and to amuse myself with the inaccuracies. To that extent I enjoyed the hour & 11 minutes very much

-- It is interesting to note RE: the movies that have been released about the Gunfight at OK Corral: the movies have become progressively MORE accurate; the later movies are far more accurate than the earlier ones. I guess that initially, people were only interested in the mythology of Wyatt, Doc, and the Gunfight. As time goes by, people became more interested in setting the facts straight than in the mythology of it all.
-- I once read somewhere -- I am not sure where I read this, or if there is any truth to it -- that Wyatt Earp himself used to hang around Hollywood toward the end of his life and that he personally told the story of the Gunfight to a young John Ford, when he met him on the set of a movie where Ford was working as a prop guy. If that is true, and if Earp indeed told Ford the TRUE story, it is surprising that Ford would have made "My Darling Clementine," which, as great a movie as it is, is completely historically inaccurate.
-- I have been unable to find an official dvd of this movie. (Luckily, I recorded and saved it on my DVR!)
After doing some Googling, I see that a dvd is available here
http://www.lovingtheclassics.com/frontiermarshal.html I looked through some of the literature on the site; apparently, this site sells unofficial dvd's of movies that they believe have entered the public domain. Sounds like a cool idea, but I have never heard of this site before and have never used them, so I have no idea about their shadiness factor.
-- I have not found any dvd -- official or unofficial -- of the 1934 version of "Frontier Marshal." I'm very curious to see it. If any of you know how I can get a copy of it, please reply here or PM me. Thanks

-- Here is the New York Times Movie Review for the 1939 film
http://movies.nytimes.com/movie/review?res=9907E4DB1230E53ABC4151DFB1668382629EDE-- Here is the New York Times Movie Review of the 1934 film
http://movies.nytimes.com/movie/review?res=9C05E5D81E3DE23ABC4950DFB766838F629EDEThanks for reading!