History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
Having thus deliberated together in public assembly and encouraged one another, they went on with their preparations for war no less than before. And the envoys who had been sent to Samos by the Four Hundred, learning how matters stood after they had already reached Delos, remained there inactive.
About this time the Peloponnesian soldiers in the fleet at Miletus were clamouring among themselves, saying that their cause was being ruined by Astyochus and Tissaphernes; by the former because he was unwilling to fight, either before this while they themselves were still the stronger and the Athenian fleet was small, or now when the enemy were said to be rent with factions and their ships had not yet been brought together; nay, they kept waiting for the Phoenician ships which Tissaphernes was to furnish—a mere pretence and not a fact—and thus ran the risk of being worn out by delay; as for Tissaphernes, on the other hand, he was not only not producing these ships, but he was even doing harm to the fleet by not giving it maintenance regularly or in full. Therefore, they said, they ought to wait no longer but should fight to an issue. In all this it was the Syracusans who were most insistent.
Astyochus and the allies were aware of their murmuring, and it was determined after a council to fight a decisive battle; so when the disturbance at Samos was also reported to them, they put to sea with their entire fleet, one hundred and twelve in all, and bidding the Milesians proceed by land towards Mycale they sailed in the direction of Mycale themselves.