The Mantineians, having displayed unfriendliness to Sparta during the Corinthian War, were required by the latter, after the Peace of Antalcidas, to demolish their walls. On their refusal, king Agesipolis was sent to subdue them. By damming up the waters of the river Ophis he flooded the city and brought it to terms. "The city of Mantineia was now broken up, and the inhabitants were distributed again into the five constituent villages. Out of four-fifths of the population each man pulled down his house in the city, and rebuilt it in the village near to which his property lay. The remaining fifth continued to occupy Mantineia as a village. Each village was placed under oligarchical government and left unfortified." _G. Grote, History of Greece, part 2, chapter 76 (volume 9)._ ALSO IN: _Xenophon, Hellenica, book 5, chapter 2._ GREECE: B. C. 383. The betrayal of Thebes to the Spartans. When the Spartans sent their expedition against Olynthus, in 383 B. C., it marched in two divisions, the last of which, under Phoebidas, halted at Thebes, on the way, probably having secret orders to do so. "On reaching Thebes the troops encamped outside the city, round the gymnasium. Faction was rife within the city. The two polemarchs in office, Ismenias and Leontiades, were diametrically opposed, being the respective heads of antagonistic political clubs. Hence it was that, while Ismenias, ever inspired by hatred to the Lacedaemonians, would not come anywhere near the Spartan general, Leontiades, on the other hand, was assiduous in courting him; and when a sufficient intimacy was established between them, he made a proposal as follows: 'You have it in your power,' he said, addressing Phoebidas, 'this very day to confer supreme benefit on your country. Follow me with your hoplites, and I will introduce you into the citadel.'" _Xenophon, Hellenica (translated by Dakyns), book 5, chapter 2 (volume 2)._