It's December 1808 as we join the British army after their small but impressive victory at the Battle of Sahagun. With the might of Napoleon's Grande Armee streaming towards him, Sir John Moore is forced to retreat through northern Spain to the coast. Will the British Expeditionary Force be caught and destroyed in the snow? Will discipline break down? Or, can Sir John Moore steer them to one final victory before they escape? This month's episode is a long, hard look at one of the most famous campaigns in British military history. So, take off your pack, place your musket by your side and pour yourself a stiff drink - you are going to need it.