The History of Herodotus Volume Two

1. 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 and call to them by their name, they were to attack them; but if they should not shout to them, they were not to attack them: and thus the Paionians proceeded to do. Now when the Perinthians were encamped opposite to them in the suburb of their city, a challenge was made and a single combat took place in three different forms; for they matched a man against a man, and a horse against a horse, and a dog against a dog.