But viewers are often unaware that during filming for the flick, Wayne took the usual step of carrying out some of his own stunts, though these ended in the actor injuring himself.
Recalling an incident, a tweet from Wayne’s official Twitter account read: “While filming The Undefeated, Duke fractured three ribs from a horse fall and then tore a ligament in his shoulder which left one arm immobile.
“Despite the injuries, his main concern was not disappointing the fans.”
According to IMDb’s The Undefeated trivia section, Wayne took just two weeks off to heal from his injuries, and even when the star returned he continued to experience heavy pain.
Director Andrew V. McLaglen, in an attempt to maintain the film’s continuity, “had to film Wayne at an angle from that point forward” in a bid to keep “his injury hidden”.
While the injury did not affect Wayne’s career for too long, another incident in his younger days altered his life forever, forcing him into a career in front of the camera as opposed to one on the American football field.
Had Wayne not injured himself while trying to impress some girls before one training session, forcing his coach’s hand at dropping the star, the legend’s iconic filmography may never have come to light.
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An eyewitness to the incident was Wayne’s friend Eugene Clarke, who recalled the incident in Scott Eyman’s 2014 book John Wayne: The Life and Legend.
He said: “One day we went to Balboa and there was a lot of pretty USC sorority girls down there that day and we decided to do a little showing off.
“We jumped in the water – it was Duke’s idea – and started to do what the kids nowadays call body surfing.
“The waves were pretty high, real rough, and one of them caught Duke and tossed him ashore with a badly wrenched right shoulder.”
John Wayne with Kirk Douglas (Image: GETTY)
He explained that Wayne had to report to football training a couple days later, but Wayne’s shoulder remained in “pretty bad shape” despite resting it.
Wayne held the position as a tackle and appeared to follow his coach Howard Jones’ advice, who was meticulous in his wish for players in his role to “block the opposing lineman, you hit him with your right shoulder… real hard”.
Clarke continued: “If Duke tried to do that with his injured shoulder it would have killed him. So what he tried to do was twist his body around so he could block with the left shoulder. Well, Jones saw him do that and that was all he needed.
“All hell broke loose. Jones accused the Duke of being yellow, of being afraid to block and demoted him to the scrubs.”