Xeones then is paired with Alexandros, the son of a high-ranking Spartan officer, whom he befriends. In contrast to the reluctant warrior that is Alexandros, Xeones also experiences the caustic rhetoric of the helot "Rooster," son of a Spartan warrior and helot mistress. It is with these two companions that Xeones is trained in the Spartan methods of war as a helot squire. He is assigned to Dionekes, a calm, focused soldier who is the mentor of Alexandros. Dionekes is selected to accompany King Leonidas and 300 Spartan warriors to defend the "hot gates" at Thermopylae in a delaying action against the Persian multitudes invading Greece under King Xerxes.
The Spartans and their allies hold the pass for several days against the onrush of the Persian army. Eventually, a greek traitor leads the Persian Immortals (elite troops of the Persian empire) through a secret mountain pass that allows them to encircle the Spartan position. Leonidas orders the evacuation of all allies,