Meanwhile the conclusion of the alliance with Lacedæmon—about November or December, 418 B.C.—had still farther depressed the popular leaders at Argos. The oligarchical faction, and the chosen regiment of the Thousand, all men of wealth and family, as well as bound together by their common military training, now saw their way clearly to the dissolution of the democracy by force, and to the accomplishment of a revolution. Instigated by such ambitious views, and flattered by the idea of admitted headship jointly with Sparta, they espoused the new policy of the city with extreme vehemence, and began immediately to multiply occasions of collision with Athens. Joint Lacedæmonian and Argeian envoys were despatched to Thrace and Macedonia. With the Chalkidians of Thrace, the revolted subjects of Athens, the old alliance was renewed and even new engagements concluded; while Perdikkas of Macedonia was urged to renounce his covenants with Athens, and join the new confederacy. In that quarter the influence of Argos was considerable; for the Macedonian princes prized very highly their ancient descent from Argos, which constituted them brethren of the Hellenic family. Accordingly, Perdikkas consented to the demand and concluded the new treaty; insisting, however, with his habitual duplicity, that the step should for the moment be kept secret from Athens.[138] In farther pursuance of the new tone of hostility to that city, joint envoys were also sent thither, to require that the Athenians should quit Peloponnesus, and especially that they should evacuate the fort recently erected near Epidaurus. It seems to have been held jointly by Argeians, Mantineians, Eleians, and Athenians; and as the latter were only a minority of the whole, the Athenians in the city judged it prudent to send Dêmosthenês to bring them away. That general not only effected the retreat, but also contrived a stratagem, which gave to it the air almost of an advantage. On his first arrival in the fort, he proclaimed a gymnastic match outside of the gates for the amusement of the whole garrison, contriving to keep back the Athenians within until all the rest had marched out: then hastily shutting the gates, he remained master of the place.[139] Having no intention, however, of keeping it, he made it over presently to the Epidaurians themselves, with whom he renewed the truce to which they had been parties jointly with the Lacedæmonians five years before, two years before the Peace of Nikias.[140] [138] Compare Thucyd. v, 80, and v, 83. [139] The instances appear to have been not rare, wherein Grecian towns changed masters, by the citizens thus going out of the gates all together, or most part of them, for some religious festival. See the case of Smyrna (Herodot. i, 150), and the precautionary suggestions of the military writer Æneas, in his treatise called Poliorketicus, c. 17.