Meanwhile Kleomenês had returned to Sparta full of resentment against the Athenians, and resolved on punishing them, as well as on establishing his friend Isagoras as despot over them. Having been taught, however, by humiliating experience, that this was no easy achievement, he would not make the attempt, without having assembled a considerable force; he summoned allies from all the various states of Peloponnesus, yet without venturing to inform them what he was about to undertake. He at the same time concerted measures with the Bœotians, and with the Chalkidians of Eubœa, for a simultaneous invasion of Attica on all sides. It appears that he had greater confidence in their hostile dispositions towards Athens than in those of the Peloponnesians, for he was not afraid to acquaint them with his design,—and probably the Bœotians were incensed with the recent interference of Athens in the affair of Platæa. As soon as these preparations were completed, the two kings of Sparta, Kleomenês and Demaratus, put themselves at the head of the united Peloponnesian force, marched into Attica, and advanced as far as Eleusis on the way to Athens. But when the allies came to know the purpose for which they were to be employed, a spirit of dissatisfaction manifested itself among them. They had no unfriendly sentiment towards Athens; and the Corinthians especially, favorably disposed rather than otherwise towards that city, resolved to proceed no farther, withdrew their contingent from the camp, and returned home. At the same time, king Demaratus, either sharing in the general dissatisfaction, or moved by some grudge against his colleague which had not before manifested itself, renounced the undertaking also. And these two examples, operating upon the preëxisting sentiment of the allies generally, caused the whole camp to break up and return home without striking a blow.[297] [297] Herodot. v, 75. We may here remark that this is the first instance known in which Sparta appears in act as recognized head of an obligatory Peloponnesian alliance,[298] summoning contingents from the cities to be placed under the command of her king. Her headship, previously recognized in theory, passes now into act, but in an unsatisfactory manner, so as to prove the necessity of precaution and concert beforehand,—which will be found not long wanting. [298] Compare Kortüm, Zur Geschichte Hellenischer Staats-Verfassungen, p. 35 (Heidelberg, 1821). I doubt, however, his interpretation of the words in Herodotus (v, 63)—εἴτε ἰδίῳ στόλῳ, εἴτε δημοσίῳ χρησόμενοι.