John Wayne's respect was earned by Rock Hudson on The Undefeated set, where Duke seriously injured himself but powered on through to complete the picture.

Watch the trailer for The Undefeated (1969)

Back in 1968, having shot his Oscar-winning performance as Rooster Cogburn in True Grit , John Wayne made another Western with Rock Hudson.

The Undefeated followed the French Imperial intervention in Mexico during the 1860s and was loosely based on a Confederate General’s real escape south of the US border after the American Civil War. Article continues below ADVERTISEMENT

According to the closeted co-star ’s lover Marc Christian, who wasn’t allowed on the three-month location shoot, Duke would pick on Hudson during filming before the pair became friends.

According to Mark Griffin’

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