The final instalment looks to the skies and the RAF's struggle to prevent a Nazi invasion in the darkest days of WWII when Britain stood alone. Dan Snow experiences how the Battle of Britain was fought at the limits of human endurance when he takes flight in a high performance stunt plane. Recreating the spiralling turns of a dogfight, he feels the extraordinary side-effects of the high G forces felt by pilots in this critical battle of WWII. Using revolutionary graphics, Peter Snow gives a blow-by-blow account of the pivotal moments of the battle and how the RAF held off the might of the German Luftwaffe during the summer of 1940. The future of the entire country was at stake in this, the first great air battle in history.