When Alexander returned and told him what he had heard from the Athenians, Mardonius set forth from Thessaly and led his army with all zeal against Athens; he also took with him all the people to whose countries he came along the way. The rulers of Thessaly did not repent of what they had already done and were readier than before to further his march. Thorax of Larissa, who had given Xerxes safe-conduct in his flight, now, without any attempt of concealment, opened a passage for Mardonius into Hellas.