In the summer of 1940, France has fallen and Britain stands alone against Nazi Germany, with invasion looking imminent. This History Hit documentary tracks the year from the fall of the West through the dogfights over southern England, the nightly bombing of British cities during the Blitz, and the planning failures inside Hitler's Operation Sea Lion that left the Kriegsmarine unable to guarantee safe passage across the Channel. Archival footage and maps trace how RAF Fighter Command, radar stations, and codebreaking intelligence combined to blunt the Luftwaffe's campaign, while the film also follows the war's spread beyond Britain's shores, into economic strain at home and military setbacks for British forces in North Africa and Greece. Rather than treating the Battle of Britain as an isolated air campaign, the film sets it inside the wider strategic picture of 1940, showing how logistics and miscalculation on the German side mattered as much as pilots in Spitfires. It closes as the conflict shifts eastward, setting up the war's next phase.