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.
And so they now turned their attention to the fortification of Deceleia and, in particular, to sending immediately some assistance to the Sicilians. Having appointed Gylippus son of Cleandridas commander of the Syracusan forces, they ordered him, in consultation with the envoys of the Syracusans and Corinthians, to devise how under present circumstances help might come to the Syracusans in the best and quickest way.
And Gylippus bade the Corinthians send to him at once at Asine[*](Probably the harbour in Messenia (4.13.1).) two ships, and to equip all the rest they intended to send, and to be ready to sail whenever opportunity offered.
Having made these arrangements the envoys left Lacedaemon and set out for home. At this time also there arrived at Athens from Sicily the trireme that had been sent by the generals for money and cavalry. And the Athenians, hearing their request, voted to send to the army both the supplies and the cavalry. And the winter ended, and with it the seventeenth year of this war of which Thucydides wrote the history.