The Battle of Cunaxa was fought in the late summer of 401 BC between the Persian king Artaxerxes II and his brother Cyrus the Younger for control of the Achaemenid throne. The great battle of the revolt of Cyrus took place 70 km north of Babylon, at Cunaxa, on the left bank of the Euphrates. The main source is Xenophon, a Greek soldier who participated in the fighting. Despite the success in the battle achieved by the interaction of the Greek mercenaries and the Persian troops of Cyrus, the outcome of the battle and the death of the pretender to the throne led to the defeat of the entire uprising and forced Greeks to commit Anabasis.