They Met at Midnight (1946)

Anna Neagle plays a World War II W.R.E.N., the British counterpart of the American W.A.V.E., who encounters Michael Wilding in a blacked-out Piccadilly during an air raid. They get married and have a two-day honeymoon before she is sent to Singapore. The ship, on which she leaves the doomed fortress of Singapore, is torpedoed, with all hands posted as drowned. Not quite. She's cast away on an unknown South Sea island for three years with a company of sailors. Wilding, unaware of this circumstance, marries again, this time, to an American girl, and they have a child, and then, Anna returns.