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.
And so the allies who were there went back home, having brought these matters to a settlement, and so did the Athenian envoys later, after they had finished the business on which they had come.
And the vote of the Lacedaemonians that the treaty had been broken and tliat they must go to war was determined, not so much by the influence of the speeches of their allies, as by fear of the Athenians, lest they become too powerful, seeing that the greater part of Hellas was already subject to them.
For it was in the following manner that the Athenians found themselves face to face with those circumstances in dealing with which they rose to greatness.