The war had left devastation in its wake. Discontent with the Spartan hegemony that followed (including the fact that it ceded Ionia and Cyprus to the Persian Empire at the conclusion of the Corinthian War (395–387 BC); see Treaty of Antalcidas) induced the Thebans to attack. Their general, Epaminondas, crushed Sparta at the Battle of Leuctra in 371 BC, inaugurating a period of Theban dominance in Greece. In 346 BC, unable to prevail in its ten-year war with Phocis, Thebes called upon Philip II of Macedon for aid. Macedon quickly forced the city-states into being united by the League of Corinth which led to the conquering of the Persian Empire and the Hellenistic Age had begun.