History of the Peloponnesian War
Thucydides
Thucydides. The Peloponnesian War. London, J. M. Dent; New York, E. P. Dutton. 1910.
In the meantime the Athenians were not idle.
During this same winter, as they had determined, they contributed timber and pushed on their ship-building, and fortified Sunium to enable their corn-ships to round it in safety, and evacuated the fort in Laconia which they had built on their way to Sicily; while they also, for economy, cut down any other expenses that seemed unnecessary, and above all kept a careful look-out against the revolt of their confederates.