After Palmer's (Tyrone Power) patrol boat is sunk during the Japanese invasion, he and his crew are trying to get back to the US Navy.
However, their attempts fail and Palmer begins to work with US personnel and Filipinos to fight back against the Japanese and prepare for the return of the US forces led by General MacArthur...
This is an enjoyable war movie with some classic tropes as well as plenty of jingoism but that is to be expected from a Second World War film made so soon after the events being recounted.