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.
After devastating the country, the Locrians retired with their land-forces, but their ships remained to guard Messana; and others that were being manned were to go to that station, and carry on the war from it.
About the same period of the spring, before the corn was ripe, the Peloponnesians and their allies made an incursion into Attica, under the conduct of Agis son of Archidamus, king of the Lacedaemonians; and pitching their camp in the country, proceeded to lay it waste.
But the Athenians despatched the forty ships to Sicily, as they had been preparing to do, and the remaining generals, Eurymedon and Sophocles; for Pythodorus, the third of them, had already arrived in Sicily before them.
These they also ordered to attend, as they sailed by the island, to those of the Corcyraeans who were in the city, and who were being plundered by the exiles on the mountain; sixty ships having likewise sailed from the Peloponnese to assist those on the mountain, and with an idea, that as there was a great famine in the city, they should easily possess themselves of the government.