The same winter the Chians pulled down their new wall at the command of the Athenians, who suspected them of meditating an insurrection, after first however obtaining pledges from the Athenians, and security as far as this was possible for their continuing to treat them as before. Thus the winter ended, and with it ended the seventh year of this war of which Thucydides is the historian. In first days of the next summer there was an eclipse of the sun at the time of new moon, and in the early part of the same month an earthquake. Meanwhile, the Mitylenian and other Lesbian exiles set out, for the most part from the continent, with mercenaries hired in Peloponnese, and others levied on the spot, and took Rhoeteum, but restored it without injury on the receipt of two thousand Phocaean staters. After this they marched against Antandrus and took the town by treachery, their plan being to free Antandrus and the rest of the Actaean towns, formerly owned by Mitylene but now held by the Athenians. Once fortified there, they would have every facility for ship-building from the vicinity of Ida and the consequent abundance of timber, and plenty of other supplies, and might from this base easily ravage Lesbos, which was not far off, and make themselves masters of the Aeolian towns on the continent. While these were the schemes of the exiles, the Athenians in the same summer made an expedition with sixty ships, two thousand heavy infantry, a few cavalry, and some allied troops from Miletus and other parts, against Cythera, under the command of Nicias, son of Niceratus, Nicostratus, son of Diotrephes, and Autocles, son of Tolmaeus. Cythera is an island lying off Laconia, opposite Malea; the inhabitants are Lacedaemonians of the class of the Perioeci; and an officer called the judge of Cythera went over to the place annually from Sparta. A garrison of heavy infantry was also regularly sent there, and great attention paid to the island, as it was the landing-place for the merchantmen from Egypt and Libya, and at the same time secured Laconia from the attacks of privateers from the sea, at the only point where it is assailable, as the whole coast rises abruptly towards the Sicilian and Cretan seas.