History of the Peloponnesian War

The Athenians, however, did not wish to run the risk of arbitration, but to send the expedition as quickly as possible; being enraged to think that even the inhabitants of the islands now presumed to revolt from them, trusting in the power of the Lacedaemonians by land, which could not help them.

And indeed the truth of the question respecting the revolt was rather as the Athenians maintained; for the Scionaeans revolted two days after the truce was signed. Accordingly, at the instigation of Cleon, they at once passed a decree that they should reduce the Scionaeans, and put them to death; and so, while they remained quiet from other undertakings, they were engaged in preparing for this.