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.
And now the whole army having returned, threw down the wall, tore up the palisades, transferred the pales to their own lines, and erected a trophy.
The next day the Athenians, setting out from their lines, began to build at the cliffs over the marsh, which on this side of Epipolae looks towards the great harbour, and in which direction their wall of circumvallation would be finished in the shortest distance by their going down over the plain and the marsh to the harbour.
The Syracusans meanwhile went out, and on their part also began again to interrupt the line by a palisade, commencing from the city across the middle of the marsh;