History of the Peloponnesian War

The Corinthians, meanwhile, were coming to their assistance from Leucas with their other ships as quickly as they could, and Gongylus, one of the Corinthian commanders, who had put to sea last of all with a single vessel, arrived first at Syracuse, though but a little before Gylippus. Finding them on the point of holding an assembly to consult on bringing the war to a conclusion, he prevented their doing so, and reassured:

them by saying that there were other ships still sailing up, and Gylippus, son of Cleandridas, sent by the Lacedaemonians in command of them. Upon this the Syracusans were reassured, and immediately went out in full force for the purpose of meeting Gylippus;

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.