The Lacedaemonians, meanwhile, finding the war against the rebels in Ithome likely to last, invoked the aid of their allies, and especially of the Athenians, who came in some force under the command of Cimon. The reason for this pressing summons lay in their reputed skill in siege operations; a long siege had taught the Lacedaemonians their own deficiency in this art, else they would have taken the place by assault. The first open quarrel between the Lacedaemonians and Athenians arose out of this expedition. The Lacedaemonians, when assault failed to take the place, apprehensive of the enterprising and revolutionary character of the Athenians, and further looking upon them as of alien extraction, began to fear that, if they remained, they might be tempted by the besieged in Ithome to attempt some political changes. They accordingly dismissed them alone of the allies, without declaring their suspicions, but merely saying that they had now no need of them. But the Athenians, aware that their dismissal did not proceed from the more honourable reason of the two, but from suspicions which had been conceived, went away deeply offended, and conscious of having done nothing to merit such treatment from the Lacedaemonians; and the instant that they returned home they broke off the alliance which had been made against the Mede, and allied themselves with Sparta’s enemy Argos; each of the contracting parties taking the same oaths and making the same alliance with the Thessalians. Meanwhile the rebels in Ithome, unable to prolong further a ten years’ resistance, surrendered to Lacedaemon; the conditions being that they should depart from Peloponnese under safe conduct, and should never set foot in it again: any one who might hereafter be found there was to be the slave of his captor. It must be known that the Lacedaemonians had an old oracle from Delphi, to the effect that they should let go the suppliant of Zeus at Ithome. So they went forth with their children and their wives, and being received by Athens from the hatred that she now felt for the Lacedaemonians, were located at Naupactus, which she had lately taken from the Ozolian Locrians. The Athenians received another addition to their confederacy in the Megarians; who left the Lacedaemonian alliance, annoyed by a war about boundaries forced on them by Corinth. The Athenians occupied Megara and Pegae, and built the Megarians their long walls from the city to Nisaea, in which they placed an Athenian garrison. This was the principal cause of the Corinthians conceiving such a deadly hatred against Athens.