Phœbidas fell in with the proposed plot, and the day of the feast of the Thesmophoria was appointed for its execution. On that day the women of the city celebrated by themselves a festival in the ancient temple of Demeter on the Cadmea. Phœbidas was to make a feint of striking camp and setting out on his march northwards. While the council was assembled in a hall in the market-place and the heat of noon-day kept the rest of the population indoors, Leontiades galloped after the departing general, led him unobserved up to the citadel, and opened the gates to him. He then hied to the council, announced what had taken place, and had Ismenias arrested as a seditious person. The leaders and adherents of the opposition, to the number of three hundred, were obliged to flee for their lives to Athens. The occupation of the Cadmea was a political necessity, the logical consequence of the efforts of Sparta to secure the hegemony. The experiences of the last war had not been suffered in vain. While Agesilaus was pursuing his victorious career in Asia a coalition against Sparta had been formed in Greece at the instigation of Persia, and Thebes had shown herself most zealous in promoting this anti-Spartan combination which was so grave a menace to the existence of Lacedæmon. This time Sparta was once more undertaking a war on the confines of Greece; if fortune were adverse, if a battle were lost, she had no guarantee against the possibility--the probability even--that hostile Thebes, still barely subdued, might revolt again, bar the way of retreat against the Spartan army, and throw the most serious obstacles in the way of reinforcements. “The Cadmea was the decisive point for the security of the line of march,” says Curtius. If a prolonged war were to be waged in the distant north it was essential that this position should be in friendly hands. And the only way of attaining this object was to juggle the reins of government into the hands of the oligarchical party in Thebes and to garrison the citadel with Spartan hoplites for their protection. The success of the expedient proves how well worth while it had been for Phœbidas to take the circuitous route.