During WWII, a team of Royal Marines are sent on a perilous mission to infiltrate and destroy an impregnable harbour in German-occupied France in Cockleshell Heroes.
At the height of the Second World War, a battalion of German ships are safely docked at the "unassailable" port of Bordeaux. Newly promoted Major Stringer (José Ferrer, also behind the camera as director) has a unique idea send a team of commandos out in collapsible canoes, have them paddle seventy miles upriver in arduous conditions and blow up the German ships with limpet mines.