One of a cycle of Boys Own war adventure films that were popular family entertainment in the 1960s. This one is clearly influenced by the James Bond films and incorporates espionage and the evil baddies, in this case the Nazis, in their underground lair. With an all star cast this had great appeal and being British made and on location in the UK it remains popular as it pushes the myth of the Second World War as a contest between the plucky English and the nasty Hun. It's historically all over the place but never intended to be a realistic depiction of events but a roustabout adventure film with plenty of action. In this case handsome American star (so as to appeal to the US market) George Peppard is Curtis, a cocky American pilot recruited by British intelligence because of his engineering qualifications to infiltrate the German installation making experimentation rockets. Assisted by John Mills, Anthony Quayle, Sophia Loren (her husband Carlo Ponti produced the film!), Trevor Howard, Tom Courtney, Richard Todd, Sylvia Sims et al this will be a favourite of many although there are far better films to be found of this type of war drama. Viewed today it's more likely to raise a smile at the clumsy script and stereotypical characters.