History of the Peloponnesian War
Thucydides
Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.
Having spent the night there, the next day they sailed in column towards Syracuse, with the rest of the ships; for ten of their squadron they had sent on before, to sail into the great harbour, and observe whether there were any fleet launched; and to proclaim from their ships,
that the Athenians were come to reinstate the Leontines in their own country, on the ground of alliance and kindred; and therefore that such of them as were in Syracuse should withdraw from it, and without any apprehension join the Athenians, as friends and benefactors..