History of the Peloponnesian War
Thucydides
Thucydides. History of the Peloponnesian War. Crawley, Richard, translator. London and Toronto: J. M. Dent and Sons Ltd.; New York: E. P. Dutton and Co., 1914.
The latter waited for thirteen days, and then, as they were exposed to the weather and without provisions, and met with no success, went back to Naxos, where they made places for their ships to lie in, erected a palisade round their camp, and retired into winter quarters; meanwhile they sent a galley to Athens for money and cavalry to join them in the spring.
During the winter the Syracusans built a wall on to the city, so as to take in the statue of Apollo Temenites, all along the side looking towards Epipolae, to make the task of circumvallation longer and more difficult, in case of their being defeated, and also erected a fort at Megara and another in the Olympieum, and stuck palisades along the sea wherever there was a landing place.