From our Trivia section in the opening post.
Although Stefanie Powers claims that John Ford came to the set to direct the movie for a week, Andrew V. McLaglen the director says that it never happened. He says he was there for the entire shoot of the movie.
In addition to this I have cross referenced a couple of books,
including John Wayne: American
and there is no mention of this,
so I wonder if Miss Powers WAS indeed mistaken!!