In 1939, war breaks out again between Britain, France, and Germany. A British Expeditionary Force is shipped across the Channel, and settles down to await the inevitable. The spring of 1940 sees the British Army driven back into the sea. A scratch force of gunners, Territorials and infantry make their stand in the historic town of Calais. They are outnumbered and outgunned, desperately trying to defend a town that's being blasted into rubble...