At first the Byzantines entered upon the war with energy, in full confidence of receiving the assistance of Achaeus; and of being able to cause Prusias as much alarm and danger by fetching Tiboetes from Macedonia as he had done to them. For Prusias, entering upon the war with all the animosity which I have described, had seized the place called Hieron at the entrance of the channel, which the Byzantines not long before had purchased for a considerable sum of money, because of its convenient situation; and because they did not wish to leave in any one else’s hands a point of vantage to be used against merchants sailing into the Pontus, or one which commanded the slave trade, or the fishing. Besides this, Prusias had seized in Asia a district of Mysia, which had been in the possession of Byzantium for many years past. Meanwhile the Rhodians manned six ships and received four from their allies; and, having elected Xenophantus to command them, they sailed with this squadron of ten ships to the Hellespont. Nine of them dropped anchor near Sestos, and stopped ships sailing into the Pontus; with the tenth the admiral sailed to Byzantium, to test the spirit of the people, and see whether they were already sufficiently alarmed to change their minds about the war. Finding them resolved not to listen he sailed away, and, taking up his other nine ships, returned to Rhodes with the whole squadron. Meanwhile the Byzantines sent a message to Achaeus asking for aid, and an escort to conduct Tiboetes from Macedonia. For it was believed that Tiboetes had as good a claim to the kingdom of Bithynia as Prusias, who was his nephew.