The history of the world can be read as an accounting of the rise and fall of nations whose survival or demise depended upon the strength of their military might. From ancient times the great civilizations – Mayans, Zulus, Spartans, Romans, Vikings, Samurai, and Barbarians – produced warriors of epic proportions, improvised brilliant battle strategies and employed advanced weaponry to overcome their enemies. For this History Channel special Green Beret Terry Schappert takes the viewer back in time for an in-depth look at ten of the world’s most fierce fighting forces.