III. In the mean while the new ascendency of Athens was already endangered. The Carystians in the neighbouring isle of Euboea openly defied her fleet, and many of the confederate states, seeing themselves delivered from all immediate dread of another invasion of the Medes, began to cease contributions both to the Athenian navy and the common treasury. For a danger not imminent, service became burdensome and taxation odious. And already some well-founded jealousy of the ambition of Athens increased the reluctance to augment her power. Naxos was the first island that revolted from the conditions of the league, and thither Cimon, having reduced the Carystians, led a fleet numerous and well equipped. Whatever the secret views of Cimon for the aggrandizement of his country, he could not but feel himself impelled by his own genius and the popular expectation not lightly to forego that empire of the sea, rendered to Athens by the profound policy of Themistocles and the fortunate prudence of Aristides; and every motive of Grecian, as well as Athenian, policy justified the subjugation of the revolters--an evident truth in the science of state policy, but one somewhat hastily lost sight of by those historians who, in the subsequent and unlooked-for results, forgot the necessity of the earlier enterprise. Greece had voluntarily intrusted to Athens the maritime command of the confederate states. To her, Greece must consequently look for no diminution of the national resources committed to her charge; to her, that the conditions of the league were fulfilled, and the common safety of Greece ensured. Commander of the forces, she was answerable for the deserters. Nor, although Persia at present remained tranquil and inert, could the confederates be considered safe from her revenge. No compact of peace had been procured. The more than suspected intrigues of Xerxes with Pausanias were sufficient proofs that the great king did not yet despair of the conquest of Greece. And the peril previously incurred in the want of union among the several states was a solemn warning not to lose the advantages of that league, so tardily and so laboriously cemented. Without great dishonour and without great imprudence, Athens could not forego the control with which she had been invested; if it were hers to provide the means, it was hers to punish the defaulters; and her duty to Greece thus decorously and justly sustained her ambition for herself.