Under Darius the Great, the mighty Persian army swollen by 10,000 Immortal warriors have come to subjugate the Greeks. In their path stands an army of freeborn Athenians, and among them is fearsome and cunning soldier-statesman, Xanthippus. Ten years later, Xanthippus watches helplessly as Athens succumbs to the bitter politics of factionalism, when the Persians cross the Hellespont in ever greater numbers to raze Athens to the ground. Facing overwhelming forces by land and sea, the Athenians call on their Spartan allies for assistance to delay the Persians at the treacherous pass of Thermopylae?