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.
Demosthenes, who had continued in a private capacity since his return from Acarnania, was, at his own request, authorized by them to use that fleet, if he wished, for service about the Peloponnese.
When, on their voyage, they were off Laconia, and heard that the Peloponnesian ships were already at Corcyra, Eurymedon and Sophocles were for hastening thither, but Demosthenes desired them to touch first at Pylus, and after doing what was necessary, then to proceed on their voyage. While they were making objections, a storm happened to come on, and carried the fleet to Pylus.
So Demosthenes immediately begged them to fortify the place, (for this, he said, was his object in sailing with them,) and showed them that there was great abundance of timber and stone, and that the post was a strong one, and unoccupied, both itself and a considerable distance of the country round. For Pylus is about four hundred stades from Sparta, and is situated in what was once the Messenian territory, being called by the Lacedaemonians Coryphasium. But the commanders said that there were many unoccupied promontories in the Peloponnese, if he wished to put the state to expense by occupying them.
He, however, considered that this was a more advantageous post than any other, inasmuch as there was a harbour close by, and the Messenians, who in early times were connected with the place, and spoke the same dialect with the Lacedaemonians, would do them very great injury by their excursions from it, and at the same time be trusty guardians of the place.