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.
Meanwhile his arrival in the Thracian country no sooner became known to the Athenians than they declared war against Perdiccas, whom they regarded as the author of the expedition, and kept a closer watch on their allies in that quarter.