JJ begins by following in the footsteps of the British soldiers' desperate retreat after the Nazis' blitzkrieg invasion of France - counting down the seven days that led to Churchill's order to evacuate the British Army in France.

JJ Chalmers examines the final battle to keep German forces back as the evacuation of Allied soldiers neared its conclusion, with a thin line of exhausted troops holding them back. On the beaches of Dunkirk, JJ explores how British ingenuity resulted in the construction of jetties using abandoned lorries, while Raksha Dave examines the truth of the armada of little ships that sailed to the rescue.