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Xerxes stayed for many days in the region of Pieria while a third part of his army was clearing a road over the Macedonian mountains so that the whole army might pass by that way to the Perrhaebian country. Now it was that the heralds who had been sent to Hellas to demand earth, some empty-handed, some bearing earth and water, returned.
These places, then, were thought by the Greeks to suit their purpose. After making a thorough survey, they concluded that the barbarians could not make use of their entire army, nor of their horsemen. They therefore resolved, that they would meet the invader of Hellas here. Then, when they heard that the Persian was in Pieria, they broke up from the Isthmus and set out with their army to Thermopylae and with their fleet to Artemisium.