History series presented by Dick Strawbridge, in which a team of modern-day engineers is challenged to rebuild some of history's most impressive machines and to use their 21st-century knowledge to improve them. The team sets out to build a medieval machine gun known as a Ribauldequin. The toughest and most dangerous part will be casting the barrels, dealing with molten bronze in excess of 1,000 degrees Centigrade. They are also making bullets and playing with gunpowder. What could possibly go wrong?