I think Arness was appearing on TV fairly regularly, in the TV Gunsmoke movies, and also the remake of Red River around the time of this film. They wanted to use footage from Duke's film for the battle, but according to Burt Kennedy, Michael Wayne wanted too much money for it. So they used the Last Command-which was at least decent in most scenes. In the end tho, it really wasn't much more accurate than Duke's version.
