Thucydides, History of the Peloponnesian War
Benjamin Jowett, Ed.

14. Chalcideus and Alcibiades on their voyage seized every one whom they met in order that their¹ coming might not be reported. They touched first at the promontory of Corycus on the mainland, and there releasing their prisoners they held a preliminary conference with certain of the Chians, who were in the plot, and who advised them to give no notice of their intention, but to sail at once to the city. [2] So they appeared suddenly at Chios, to the great wonder and alarm of the people. The oligarchs had contrived that the council should be sitting at the time. Chalcideus and Alcibiades made speeches and announced that many more ships were on their way, but said nothing about the blockade of Piraeum. [3] So Chios first, and afterwards Erythrae, revolted from Athens. They then sailed with three vessels to Clazomenae, which they induced to revolt. The Clazomenians at once crossed over to the mainland and fortified Polichnè, intending in case of need to retreat thither from the little island on which Clazomenae stands. All the revolted cities were occupied in raising fortifications and preparing for war.