In real life, Clifton James, an actor who looked a lot like Montgomery was asked by the secret service to play Monty's part for a week. It was the eve of D-Day and the British wanted to fool the Nazis, or at least confuse them as much as possible, by having Monty visiting southern posts like Gibraltar.
Apart from the fact that probably the Germans did not buy 100% the possibility of the invasion coming from Southern France, there is not much of a story to tell.
In the movie, Clifton James plays himself, but the film was made over 15 years after the events and the guy looks very old, albeit still a believable Monty lookalike. To pad the flimsy script, John Mills plays a horny major who sets the plan in motion and to give some thrills, a fictional kidnapping of Monty by the Nazis takes place at the very end.
Apart from the fact that probably the Germans did not buy 100% the possibility of the invasion coming from Southern France, there is not much of a story to tell.
In the movie, Clifton James plays himself, but the film was made over 15 years after the events and the guy looks very old, albeit still a believable Monty lookalike. To pad the flimsy script, John Mills plays a horny major who sets the plan in motion and to give some thrills, a fictional kidnapping of Monty by the Nazis takes place at the very end.