Actually, John Wayne is not the best part of this film. The opening scenes deal with the end of the Civil War. Wayne plays Colonel John Henry Thomas, whose men have followed him from Texas to fight for the Union and are not sick of soldiering and ready to go home. The plan is that they are going to put together a herd of wild horses and sell them to representatives of the Mexican government, who are offering the best price. Of course, Mexico might be about to have its own Civil War. Meanwhile, the defeat of the Confederacy and the arrival of Northern carpetbaggers have convinced Colonel James Langdon (Rock Hudson) and his men that there is nothing left for them in the South. So his plan is to lead his men and their families to Mexico to serve in the military for the government of the Emperor Maximillian trying to hold onto power.

The two groups of former enemies meet along the way and after fighting Indians together achieve something of a rapprochement, mainly because Rock and the Duke are manly men and hit it off. They two big stars acting together, with Rock upstaging an amiable Duke at just about every opportunity. The idea of what expatriate Confederates during after the Civil War is an interesting one, but the script only deals with that as a means of setting up the rest of the film.

Of course since the former Confederates are traveling with women and the ex-Union soldiers only brought horses, the romantic subplots involve overlooking the minor past differences of the war that killed a half million Americans. Colonel Langdon's sister-in-law (Marian McCargo) grudgingly sparks to John Henry, despite the fact his unit was as Shiloh where her husband was killed. But it is hard to pay attention to any notion of a mature relationship when young Charlotte Langdon (Melissa Newman), the Colonel's daughter takes an interest in Blue Boy (L.A. Rams quarterback Roman Gabriel), John Henry's Cherokee Indian adopted son, which does not sit well with her beau, Lt. Bubba Wilkes (Michael Vincent before he was Jan-Michael Vincent, and I swear I did not make up that "Bubba" name).

Another NFL player, a then relatively unknown Merlin Olsen, plays Corporal Little George, a gentle giant for gets to fight for the honor of the Confederacy from time to time. You will also see former Miss America Lee Meriwether as Colonel Langdon's wife along with veteran character actors Ben Johnson as Short Grub, Harry Carey, Jr. as on of Thomas' riders, and Royal Dano as a dignified Confederate officer.

This is really a 3.5 star movie. It is not as good as I remember and there are all sorts of problematic elements to the film simply because "The Undefeated" is pretty much doing things by the numbers. There are no big surprises here once you know the players and it is simply a question of watching it all play out. In the end I round up simply because of the scenes between Wayne and Hudson, and that is without getting into the fascinating sub-text of the personification of American machismo acting opposite the biggest Hollywood star in the closet. I have seen some evidence that the Duke knew about Rock's secret, but there is nothing in the film to suggest it bothered him.