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.
Aristonymus assented for the other places, but, finding on a calculation of the days that the Scionaeans had revolted after the agreement, he said that they would not be included in the truce. Brasidas, however, earnestly maintained that they had revolted before, and would not give up the city.
Whereupon Aristonymus sent word to Athens about these matters, and the Athenians were ready at once to make an expedition against Scione. But the Lacedaemonians sent envoys, saying that the Athenians would be violating the truce, and trusting the word of Brasidas they laid claim to the town and were ready to arbitrate about it.