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.
for by this time they perceived him actually near at hand. He, having taken on his passage Jetae, a fortress of the Sicels, and having formed his men for battle, arrived at Epipolae; after mounting which, on the side by Euryelus, where the Athenians also had ascended at first, he advanced in company with the Syracusans against the Athenian lines.
He happened to have come at so critical a time, that a double wall of seven or eight stades length had already been completed by the Athenians, extending to the great harbour, except for a short distance near the sea, which they were still building. For the rest of their lines, to Trogilus on the other sea, stones had already been laid for the greater part of the distance, and some points were left half finished, while others were entirely completed. To such extreme danger had Syracuse been reduced.
The Athenians, though thrown into consternation at first by the sudden attack made upon them by Gylippus and the Syracusans, quickly drew up for battle. Gylippus halted near them, and sent on a herald to tell them, that if they chose to depart from Sicily within five days, taking what belonged to them, he was ready to make a truce to that effect.
They, however, paid no attention to him, and sent him back again without giving any answer. After this, they made their preparations against each other.
And Gylippus, seeing the Syracusans in disorder and not easily falling into line, drew off his forces more into the open ground; while Nicias did not lead the Athenians against them, but remained still near his own wall. When Gylippus found that they were not advancing, he withdrew his army to what is called the citadel of Temenites, and there they stationed themselves for the night.
The next day he took the greater part of his forces, and drew them up near the walls of the Athenians, to prevent their going to the relief of any other quarter, while he sent a detachment to the fort of Labdalum, and took it, and put to the sword all the men he found in it; the place not being within sight of the Athenians.
On the same day, too, a trireme of the Athenians, moored off the harbour, was taken by the Syracusans.