This intrigue, coming to the knowledge of the Thebans, determined them to strike a decisive blow. Their presidency, over more than one of the minor Bœotian cities, had always been ungentle, suitable to the roughness of their dispositions. Towards Platæa, especially, they not only bore an ancient antipathy, but regarded the reëstablished town as little better than a Lacedæmonian encroachment, abstracting from themselves a portion of territory which had become Theban, by prescriptive enjoyment lasting for forty years from the surrender of Platæa in 427 B.C. As it would have been to them a loss as well as embarrassment, if Athens should resolve to close with the tender of Platæa,—they forestalled the contingency by seizing the town for themselves. Since the reconquest of Bœotia by Thebes, the Platæans had come again, though reluctantly, under the ancient constitution of Bœotia; they were living at peace with Thebes, acknowledging her rights as president of the federation, and having their own rights as members guaranteed in return by her, probably under positive engagement,—that is, their security, their territory, and their qualified autonomy, subject to the federal restrictions and obligations. But though thus at peace with Thebes,[337] the Platæans knew well what was her real sentiment towards them, and their own towards her. If we are to believe, what seems very probable, that they were secretly negotiating with Athens to help them in breaking off from the federation,—the consciousness of such an intrigue tended still farther to keep them in anxiety and suspicion. Accordingly, being apprehensive of some aggression from Thebes, they kept themselves habitually on their guard. But their vigilance was somewhat relaxed and most of them went out of the city to their farms in the country, on the days, well known beforehand, when the public assemblies in Thebes were held. Of this relaxation the Bœotarch Neokles took advantage.[338] He conducted a Theban armed force, immediately from the assembly, by a circuitous route through Hysiæ to Platæa; which town he found deserted by most of its male adults, and unable to make resistance. The Platæans,—dispersed in the fields, finding their walls, their wives, and their families, all in possession of the victor,—were under the necessity of accepting the terms proposed to them. They were allowed to depart in safety, and to carry away all their movable property; but their town was destroyed, and its territory again annexed to Thebes. The unhappy fugitives were constrained for the second time to seek refuge at Athens, where they were again kindly received, and restored to the same qualified right of citizenship as they had enjoyed prior to the peace of Antalkidas.[339]