As Winston Churchill watched the French army march past on Bastille Day, 1939, amid the tensions of Europe, he exclaimed "Thank God for the French army ..." and with good reason.  France had the best equipped and largest army on the continent. Further bolstered by the virtually impregnable Maginot Line on its eastern border with Germany, a fleet second only to Britain's and a mighty air force, conventional thinking was that the Franco-British forces could and would defeat Germany's Wehrmacht if need be, or starve Germany to death by blockade.  In this episode, we learn how a German general came up with the one plan that might succeed in winning the war and how the Battle of France was lost by the Allies, dooming the continent to five years of slaughter and destruction.