Alcibiades (31.2-31.3)

Accordingly, when Alcibiades came back from Selymbria, Pharnabazus demanded that he too take oath to the treaty; but Alcibiades refused to do so until Pharnabazus had taken his oath to it. After the oaths had been taken, he went up against Byzantium, which was in revolt against Athens, and compassed the city with a wall.[*] But after Anaxilaus, Lycurgus, and certain men besides had agreed to surrender the city to him on condition that it be not plundered, he spread abroad the story that threatening complications in Ionia called him away. Then he sailed off in broad daylight with all his ships;

but in the night time stealthily returned. He disembarked with the men-at-arms under his own command, and stationed himself quietly within reach of the city’s walls. His fleet, meanwhile, sailed to the harbor, and forcing its way in with much shouting and tumult and din, terrified the Byzantians by the unexpectedness of its attack, while it gave the party of Athens in the city a chance to admit Alcibiades in all security, since everybody had hurried off to the harbor and the fleet.