The History of Herodotus, volume 2

In the meantime those of the Persians who had been left behind in Europe by Dareios, of whom Megabazos was the commander, had subdued the people of Perinthos first of the Hellespontians, since they refused to be subject to Dareios. These had in former times also been hardly dealt with by the Paionians: for the Paionians from the Strymon had been commanded by an oracle of their god to march against the Perinthians; and if the Perinthians, when encamped opposite to them, should shout aloud an...