You are watching NOVA: Secrets of the Viking Sword the movie produced in United States of America belongs with duration 54 Min in Category Documentary,History,. broadcast at streamingjoy.com , by [ NOVA ] The Vikings were the most ferocious warriors of the Middle Ages. Especially fearsome were the select few who wielded a formidable weapon: a light, razor sharp, virtually indestructible sword with its maker's name, Ulfberht, inlaid along the blade..