This episode of History Date Night reviews December 1939, as WWII reshapes the world. Highlights include the RAF's disastrous daylight raid at Heligoland Bight, German and British clashes near America, and the revelation of German shipborne radar. The episode covers brutal Soviet and Nazi occupations in Poland, Finland's fierce resistance against the USSR, and the global mood at Christmas. Key military tech advances and a devastating Turkish earthquake close a year that leaves 1940 shrouded in uncertainty and fear.