The fight which followed was a fierce one, and since the barbarians had the king as a witness of their valour and the Greeks kept in mind their liberty and were exhorted to the fray by Leonidas, it followed that the struggle was amazing. [2] For since the men stood shoulder to shoulder in the fighting and the blows were struck in close combat, and the lines were densely packed, for a considerable time the battle was equally balanced. But since the Greeks were superior in valour and in the great size of their shields, the Medes gradually gave way; for many of them were slain and not a few wounded. The place of the Medes in the battle was taken by Cissians and Sacae, selected for their valour, who had been stationed to support them; and joining the struggle fresh as they were against men who were worn out they withstood the hazard of combat for a short while, but as they were slain and pressed upon by the soldiers of Leonidas, they gave way. [3] For the barbarians used small round or irregularly shaped shields, by which they enjoyed an advantage in open fields, since they were thus enabled to move more easily, but in narrow places they could not easily inflict wounds upon an enemy who were formed in close ranks and had their entire bodies protected by large shields, whereas they, being at a disadvantage by reason of the lightness of their protective armour, received repeated wounds. [4]
At last Xerxes, seeing that the entire area about the passes was strewn with dead bodies and that the barbarians were not holding out against the valour of the Greeks, sent forward the picked Persians known as the "Immortals," who were reputed to be pre-eminent among the entire host for their deeds of courage. But when these also fled after only a brief resistance, then at last, as night fell, they ceased from battle, the barbarians having lost many dead and the Greeks a small number.