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.
So it has turned out that we, who are supposed to be besieging others, are rather ourselves under siege, at least by land; for we cannot even go far into the country because of their cavalry.
"And they have also sent envoys to the Peloponnesus for another army, and Gylippus has gone to the cities of Sicily, to persuade such of them as are now neutral to join them in the war, and to bring from other cities, if he can, still further reinforcements for his army and navy.