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.
Meanwhile Astyochus, the Lacedaemonian admiral, sailed with four ships from Cenchreiae, as he had purposed, and arrived at Chios. And on the third day after his coming the twenty-five Athenian ships sailed to Lesbos, being under the command of Leon and Diomedon; for Leon had arrived afterwards with a reinforcement of ten ships from Athens.