Charles Marquis Warren is one of the worst western scriptwriters.Responsible(also for directing it) for the very mediocre -and a bit racist- "Arrowshead"-which featured Heston as well,he wrote an even more dreadful story here.Will Cody must be turning in his grave! The story is incoherent,every sequence seems to be the beginning of the film,there's the de rigueur (check "Arrowshead") Heston/Indian fight,and Jan Sterling's part is so thin it's a wonder she can do something with it(This actress found her best role in Wilder's masterpiece "the big carnival").Only the last sequences of the mail might redeem that,but the "writer" wanted a "moving" ending so he spoils everything .
You'll always be better off with Cecil B.De Mille's "the plainsman"(1936)with Gary Cooper ,Jean Arthur and James Ellison,as far as Buffalo Bill is concerned.Hickock 's character is also featured,and on top of that ,Calamity Jane in the flesh.