Defense of the Realm

S1 E3: Castles, once used to wage war, instead became palaces used to impress monarchs such as Elizabeth I, or ruins that instilled a sense of nostalgia for an age of chivalry in the British psyche. But, as this exciting history documentary reveals, just as castles seemed to have lost their defensive function, the English Civil War erupted, a tumultuous period that changed Britain forever.