401 BC e., Mesopotamia. Shahinshah Artaxerxes II, who had just ascended the throne of the largest state of the era, the power of the Achaemenids, conceived the murder of his main opponent - his brother Cyrus the Younger. Tom managed to escape, and he decided to overthrow the failed fratricide with the help of Greek mercenaries led by the Spartan Clearch, a former tyrant of Byzantium. In the battle on the banks of the Euphrates, the Hellenes showed themselves in all their glory, but the death of Cyrus made their further stay in the Persian possessions not only meaningless, but also deadly. Deprived of their livelihoods, surrounded by enemies, they must make their way from the heart of the empire to their homeland...