Thucydides, History of the Peloponnesian War
Benjamin Jowett, Ed.

83. On the following day he was overtaken by the Syracusans, who told him that Demosthenes¹ had surrendered, and bade him do the same. He, not believing them, procured a truce while he sent a horseman to go and see. [2] Upon the return of the horseman bringing assurance of the fact, he sent a herald to Gylippus and the Syracusans, saying that he would agree, on behalf of the Athenian state, to pay the expenses which the Syracusans had incurred in the war, on condition that they should let his army go; until the money was paid he would give Athenian citizens as hostages, a man for a talent. [3] Gylippus and the Syracusans would not accept these proposals, but attacked and surrounded this division of the army as they had the other, and hurled missiles at them from every side until the evening. [4] They too were grievously in want of food and necessaries. Nevertheless they meant to wait for the dead of the night and then to proceed. They were just resuming their arms, when the Syracusans discovered them and raised the Paean. [5] The Athenians, perceiving that they were detected, laid down their arms again, with the exception of about three hundred men who broke through the enemy's guard, and made their escape in the darkness as best they could.