Romans, Vikings and Celts

S1 E1: As an island nation, Britain has suffered the threat of invasion throughout its history. In this illuminating documentary, historian Sam Willis looks at the early attempts to invade, including the brutality of Neolithic warfare and the struggles that the Roman legions faced. Along the way, Sam fells a tree with a flint axe, gets to grips with a Viking boat and rides in an Iron Age chariot.