There is a scene in this Alistair MacLean wartime adventure where lead actors Richard Burton and Clint Eastwood had to scale a castle wall. While the young and fit Eastwood opted to climb the wall for real, the hard-drinking and somewhat out-of-shape Burton had to be winched up by a crane!
As a result, in the finished scene Eastwood looks exhausted at the top, while Burton looks suspiciously unaffected.
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