The conclusion of the two-part documentary drama showing how the Allied forces eventually won the First World War. Having won a great victory at Amiens, the tide was turning for the Allied forces. However, they were under no illusions - the German Army remained a daunting fighting force and it had an ace up its sleeve in the shape of the Hindenburg Line, the most formidable defensive system in military history. If the Allies were to have any hope for victory, they would need to find a way to punch through Germany's wall of steel