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The longest campaign of the war pits the deadly stealth of the Nazi U-boats against the code-breaking genius and long-range bombers of the Allies.
Summer 1940: Fierce dogfights fill the skies over Southern England, as the pilots of the RAF defend the island from ferocious German bombers.
From the first shots fired to the horrors of Auschwitz, the battle to free Poland from the grip of the Nazis is one of the toughest of the war.