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.
On the arrival of Brasidas in Thrace at the time referred to,[*](cf. 4.79.1.) the Athenians, on hearing of it, declared Perdiccas an enemy, regarding him as responsible for his coming, and they established a stricter watch over their allies in that region.