World War II opens in 1939 with Germany's Blitzkrieg through Poland, and this History Hit film follows the early campaigns through archival footage of the fall of France, the evacuation at Dunkirk, and the aerial dogfights of the Battle of Britain. The film gives particular attention to the Molotov-Ribbentrop pact, the non-aggression agreement between Hitler and Stalin that carved up Eastern Europe and briefly kept the Soviet Union out of the fighting, before tracing how that arrangement collapsed into Operation Barbarossa, the German invasion of the USSR that opened the war's largest and most catastrophic front. Rare and uncensored combat and newsreel footage carries most of the narrative, showing burning cities, retreating columns, and the small boats crossing the Channel at Dunkirk. Narration keeps the chronology moving between fronts, from Warsaw to the beaches of northern France to the Soviet border, tracking how a series of fast, brutal campaigns reshaped Europe's map within two years.