In the film, which is a part of the NOVA series Secrets of Lost Empires, a team of timber framers and other specialists design, build, and fire a pair of trebuchets, a devastating engine of war popular in the Middle Ages.

NOVA Season 27 Episodes...

• s27e01 - Fall Of The Leaning Tower
• s27e02 - Time Travel
• s27e03 - The Killer's Trail
• s27e04 - Island of the Spirits
• s27e05 - Decoding Nazi Secrets
• s27e06 - Voyage Of Doom
• s27e07 - Electric Heart
• s27e08 - Tales From The Hive
• s27e09 - Lost On Everest
• s27e10 - Secrets of Lost Empires: Medieval Siege (1)
• s27e11 - Diamond Deception
• s27e12 - Secrets of Lost Empires: Pharaoh's Obelisk (2)
• s27e13 - Trillion Dollar Bet
• s27e14 - Secrets of Lost Empires: Easter Island (3)
• s27e15 - Mystery Of The First Americans
• s27e16 - Secrets of Lost Empires: Roman Bath (4)
• s27e17 - Lost Tribes Of Israel
• s27e18 - Secrets of Lost Empires: China Bridge (5)
• s27e19 - What's Up With The Weather?
• s27e20 - Stationed In The Stars
• s27e21 - The Vikings

NOVA Show Summary

Seen in more than 100 countries, NOVA is the most watched science based television series in the world and the most watched documentary series on PBS. It is also one of television's most acclaimed series, having won many major television awards, most of them many times over.