History of the Peloponnesian War

Thucydides

Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.

About this period[*](457 B.C.) the Athenians began to build their long walls to the sea, one to Phalerum, the other to the Peiraeus. And the Phocians made an expedition against the land of the Dorians, the mother-country of the Lacedaemonians, namely the towns of Boeum, Citinium, and Erineum, one of which they captured;

whereupon the Lacedaemonians, under the lead of Nicomedes son of Cleombrotus, acting for King Pleistoanax son of Pausanias, who was still a minor, sent to the aid of the Dorians a force of fifteen hundred hoplites of their own and ten thousand of their allies, and after they had forced the Phocians to make terms and restore the city they began their return homeward.