Alice Roberts and her fellow historians explore Britain's long-standing obsession with invasion, by examining the physical reminders that are still here today
Episode 1
The team explore the story of Henry VIII's fear of invasion from Catholic Europe, told through his castles, cannons, ships and spies.
Episode 2
The story of how Britain prepared for a Nazi land invasion in World War II - from tank traps to sticky bombs, the Home Guard, and the tragic story of a forgotten wartime heroine.
Episode 3
Tales of Cold War Britain, from nuclear threat to upper-class spies, eerie ghost bunkers and our very own Chernobyl.
Episode 4
From battlefields and ancient swords to castles and a mighty cathedral, the story of William the Conqueror's journey from invader to ruler of England.
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