Meanwhile the Lacedaemonians, urged on all sides by the complaints of their allies against Athens, summoned a general meeting of the Peloponnesian confederacy at Sparta. The Corinthians took the most prominent part in the debate; but other members of the confederacy had also heavy grievances to allege against Athens. Foremost among these were the Megarians, who complained that their commerce had been ruined by a recent decree of the Athenians which excluded them from every port within the Athenian jurisdiction. It was generally felt that the time had now arrived for checking the power of Athens. Influenced by these feelings, the Lacedaemonians decided upon war; and the congress passed a resolution to the same effect, thus binding the whole Peloponnesian confederacy to the same policy. This important resolution was adopted towards the close of B.C. 432, or early in the following year. Before any actual declaration of war, hostilities were begun in the spring of B.C. 431 by a treacherous attack of the Thebans upon Plataea. Though Boeotians by descent, the Plataeans did not belong to the Boeotian league, but had long been in close alliance with the Athenians. Hence they were regarded with hatred and jealousy by the Thebans, which sentiments were also shared by a small oligarchical faction in Plataea itself. The Plataean oligarchs secretly admitted a body of 300 Thebans into the town at night; but the attempt proved a failure; the citizens flew to arms, and in the morning all the Thebans were either slain or taken prisoner. CHAPTER X. ATHENS IN THE TIME OF PERICLES. [Note: The figures referred to in a few places in this chapter have had to be omitted from the etext.]