The bulk of her army continued its retreat home. About this time the Athenians began to build the long walls to the sea, that towards Phalerum and that towards Piraeus. Meanwhile the Phocians made an expedition against Doris, the old home of the Lacedaemonians, containing the towns of Boeum, Kitinium, and Erineum. They had taken one of these towns, when the Lacedaemonians under Nicomedes, son of Cleombrotus, commanding for King Pleistoanax, son of Pausanias, who was still a minor, came to the aid of the Dorians with fifteen hundred heavy infantry of their own, and ten thousand of their allies. After compelling the Phocians to restore the town on conditions, they began their retreat. The route by sea, across the Crissaean Gulf, exposed them to the risk of being stopped by the Athenian fleet; that across Geraneia seemed scarcely safe, the Athenians holding Megara and Pegae. For the pass was a difficult one, and was always guarded by the Athenians; and, in the present instance, the Lacedaemonians had information that they meant to dispute their passage. So they resolved to remain in Boeotia, and to consider which would be the safest line of march. They had also another reason for this resolve. Secret encouragement had been given them by a party in Athens, who hoped to put an end to the reign of democracy and the building of the Long Walls. Meanwhile the Athenians marched against them with their whole levy and a thousand Argives and the respective contingents of the rest of their allies. Altogether they were fourteen thousand strong. The march was prompted by the notion that the Lacedaemonians were at a loss how to effect their passage, and also by suspicions of an attempt to overthrow the democracy. Some cavalry also joined the Athenians from their Thessalian allies; but these went over to the Lacedaemonians during the battle. The battle was fought at Tanagra in Boeotia. After heavy loss on both sides, victory declared for the Lacedaemonians and their allies. After entering the Megarid and cutting down the fruit trees, the Lacedaemonians returned home across Geraneia and the isthmus. Sixty-two days after the battle the Athenians marched into Boeotia under the command of Myronides, defeated the Boeotians in battle at Oenophyta, and became masters of Boeotia and Phocis. They dismantled the walls of the Tanagraeans, took a hundred of the richest men of the Opuntian Locrians as hostages, and finished their own long walls. This was followed by the surrender of the Aeginetans to Athens on conditions; they pulled down their walls, gave up their ships, and agreed to pay tribute in future. The Athenians sailed round Peloponnese under Tolmides, son of Tolmaeus, burnt the arsenal of Lacedaemon, took Chalcis, a town of the Corinthians, and in a descent upon Sicyon defeated the Sicyonians in battle.