The Scots inside Stirling Castle must have felt untouchable. Protected by a massive stone fortress, they prepared for a long drawn-out siege against the army of England's Edward the First. But Edward had 50 carpenters working day and night to create the medieval version of the atom bomb: the trebuchet- a fearsome, gravity-powered catapult dubbed "Warwolf" that was capable of hurling boulders, bee hives and plague-infected corpses long distances. Travel back to the Middle Ages and relive a fascinating turning point in warfare and medieval history. - Enter the battlefield and experience the chaos of medieval warfare- 200 years before the invention of the cannon - Discover how the mechanized catapult sent English history and warfare in new directions - Enter gigantic medieval castles and explore why these mighty fortresses became vulnerable to the "Warwolf" - See how the medieval manuscripts provided clues in the trebuchet mystery - See medieval experts create two competing full-scale catapults - Travel to the banks of Loch Ness as newly designed catapults attempt to destroy a castle wall with 250-pound stone balls Secrets of Lost Empires II Unlock mysteries and uncover lost history with the experts as they use yesteryear's thrilling technology to recreate five ancient engineering marvels and to discover what daily life was really like in these communities. Travel around the globe from Egypt to Rome and take a fresh, "hands-on" look at mankind's greatest cultures and civilizations. It's history from a whole new point of view!

Special DVD features include: materials and activities for educators, access to the NOVA Web site, scene selections and closed captions.