The film was particularly interesting for me as my father was stationed at the Canadian/RAF base in 1942 on Vancouver Island. He mentioned how gracious the star's were and that they took the time to visit the lads who were busy flight training. I have recently read an old RAF magazine called (The Patrician)about director, John Farrow and actor Paul Muni being livid after a British extra ruined a battle scene by laughing hysterically in front of the camera. The area of the secret German camp is actually a military/civilian firing range and is still active today. A set of over grown cement stairs that the Commando's used as they struggled up a steep bank can still be seen in the beautiful Saanich Inlet from the water 64 years later.