Having just made two extremely grim war movies ('The Camp on Blood Island', followed by 'Yesterday's Enemy') it probably came as quite a relief for Hammer Films to make this innocuous little pacifist comedy set in the Adriatic, which the exceptionally fine summer weather of 1959 probably helped them get the location work on Chobham Common in the can so quickly and bring the whole production in for a mere £75,000. (Plenty of the IMDb's own plot synopses spoil their own plots, and both Dennis Price and then Nadja Regin make their 'unexpected' appearances quite late in the film; particularly Ms Regin.)
Hammer Films has in the past been criticised for its racial insensivity in casting the likes of Christopher Lee as a Chinaman in 'The Terror of the Tongs', but here we get Dennis Price making no attempt at an appropriate accent (we're told that he went to Oxford), supposedly playing a German officer; later followed by a Serbian actress playing an Italian. (The film also contains a degree of explicit nudity we wouldn't see again in a Hammer Film until the 1970s; too bad it's George Cole rather than Nadja Regin!)