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.
The general good-will, however, inclined decidedly to the side of the Lacedaemonians, especially since they proclaimed that they were liberating Hellas. Every person and every state was strongly purposed to assist them in every possible way, whether by word or by deed, and each man thought that wherever he could not himself be present, there the cause had suffered a check.
To such an extent were the majority of the Hellenes enraged against the Athenians, some wishing to be delivered from their sway, others fearful of falling under it.
Such were the preparations and such the feelings with which the Hellenes went into the conflict. And the states which each side had as its allies when it entered the war were as follows.