Honesty seems the first quality of this Wellmann work:it uses no less than three different languages:English,Indian language and French:it's really great fun to hear the cast sing on Xmas day the Canadian "Alouette gentille alouette" en Français dans le texte...even if the words have nothing to do with Christ's birth.
The second strong point is scenery:the landscapes are breathtakingly beautiful and the color is splendid indeed.Mountains and forest are lovingly filmed .
A lot of people will probably note similarities with Delmer Daves's famous "Broken arrow" which was released the precedent year .It's almost the same ending.I would favor Daves's work over Wellmann's because his characters are more endearing , his story more absorbing and the relationship characters/nature more convincing.But "Across the wide Missouri" is worth watching :the story is told by Gable's son who appears as a baby in the movie and shortly as a child .One scene is particularly touching,even if we realize it only afterward:Gable and his Indian wife are kissing each other while the small child is watching.There are a lot of deaths in this often cruel story,but neither the White nor the Indians are demeaned.