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.
Thus they excluded the Mytilenaeans from the use of the sea; but as for the land, the Mytilenaeans and the other Lesbians, who had now come to their aid, dominated all the island, except the small strip held by the Athenians in the neighbourhood of their camps, and it was Malea rather than their camps that they used as a station for boats and supplies. Such was the course of the war at Mytilene.
About the same time during this summer the Athenians sent also on a cruise round the Peloponnesus thirty ships with Asopius son of Phormio as commander; for the Acarnanians had requested them to send them as commander either a son or some other kinsman of Phormio's.