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 towards autumn the Lacedaemonians sent three thousand hoplites of their allies, among whom were six hundred from Heracleia, the city which had recently been founded in Trachis. The commander of the expedition was Eurylochus a Spartan, who was accompanied by the Spartans Macarius and Menedaïus.