 Complete the following phrase:  If the wars of the Delian League shifted the balance of power between Greece and Persia in favour of the Greeks, then the subsequent half-century of internecine conflict in Greece did much to restore the balance of power to Persia. The Persians entered the Peloponnesian War in 411 BC forming a mutual-defence pact with Sparta and combining their naval resources against Athens in exchange for sole Persian control of Ionia. In 404 BC when Cyrus the Younger attempted to seize the Persian throne, he recruited 13,000 Greek mercenaries from all over the Greek world, of which Sparta sent 700800, believing they were following the terms of the defence pact and unaware of the armys true purpose. After the failure of Cyrus, Persia tried to regain control of the Ionian city-states, which had rebelled during the conflict. The Ionians refused to capitulate and called upon Sparta for assistance, which she provided, in 396395 BC. Athens, however, sided with the Persians, which led in turn to another large-scale conflict in Greece, the 