This film shows how the Nazis developed a terrifying new military tactic - Blitzkrieg - and how it caught first Poland and then Britain and France utterly unprepared. It charts the fall of Poland and how Hitler then conquered France in just a few weeks, an achievement that had eluded Germany throughout all the four years of World War One. It also reveals how heroic French resistance allowed the British to escape from Dunkirk and live to fight another day.
In the third episode Mary takes an in-depth look at the question of identity and citizenship within the Roman Empire. What did it mean to be, or to become, Roman, and how did the very different parts of the empire react to Roman rule?