Historian Dan Jones continues his fascinating journey across Northern France, investigating the 1346 invasion by Edward III and his English army on their Crécy campaign - one of the earliest and bloodiest raids of the Hundred Years War.

In episode one we have seen how, to start with, everything was going well for Edward and his army, including the "Essex Dogs" - the ordinary soldiers who Dan has imagined and researched for his latest book. They had already made a successful landing, ravaged the Norman countryside and sacked the grand city of Caen.

But Edward III's campaign is about to take a turn for the worse. Approaching the mighty city of Rouen, Edward learns that King Philippe VI of France, rather than shying away from action, has reinforced or destroyed all the bridges across the River Seine between the sea and Paris. He’s trying to spring a trap that will allow him to crush the English invaders.

As Edward III’s army is forced deeper and deeper into France, trying to find a way across hostile territory - with supplies running lower - the English troops find themselves in an increasingly desperate situation. They can only survive if they can somehow cross two mighty rivers and either make it to safety, or defeat the French in a pitched battle.

Dan explores the key locations with Prof. Michael Livingston - revealing the real places where the incredible events unfolded - piecing together the details of the story on the perilous riverbanks and battlefields of northern France.

Everything comes to a head by the forest of Crécy - where the English turn to fight and the French charge into a hail of arrows…

It is a moment that will define the next hundred years of history.