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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.
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.
The Allies have taken the beaches of Northern France. Now they face a brutal fight through enemy territory in a bid to liberate Europe.