The next summer, just as the corn was getting ripe, the Peloponnesians and their allies invaded Attica under the command of Archidamus, son of Zeuxidamus, king of the Lacedaemonians, and sat down and ravaged the land; the Athenian horse as usual attacking them, wherever it was practicable, and preventing the mass of the light troops from advancing from their camp and wasting the parts near the city. After staying the time for which they had taken provisions, the invaders retired and dispersed to their several cities. Immediately after the invasion of the Peloponnesians all Lesbos, except Methymna, revolted from the Athenians. The Lesbians had wished to revolt even before the war, but the Lacedaemonians would not receive them; and yet now when they did revolt, they were compelled to do so sooner than they had intended. While they were waiting until the moles for their harbours and the ships and walls that they had in building should be finished, and for the arrival of archers and corn and other things that they were engaged in fetching from the Pontus, the Tenedians, with whom they were at enmity, and the Methymnians, and some factious persons in Mitylene itself, who were proxeni of Athens, informed the Athenians that the Mitylenians were forcibly uniting the island under their sovereignty, and that the preparations about which they were so active, were all concerted with the Boeotians their kindred and the Lacedaemonians with a view to a revolt, and that, unless they were immediately prevented, Athens would lose Lesbos.