History of the Peloponnesian War

For the Corinthians, filled with confidence by the favorable alteration in Sicilian affairs which had been reported by the envoys upon their arrival, and convinced that the fleet which they had before sent out had not been without its use, were now preparing to despatch a force of heavy infantry in merchant vessels to Sicily, while the Lacedaemonians did the like for the rest of Peloponnese.

The Corinthians also named a fleet of twenty-five vessels, intending to try the result of a battle with the squadron on guard at Naupactus, and meanwhile to make it less easy for the Athenians there to hinder the departure of their merchantmen, by obliging them to keep an eye upon the galleys thus arrayed against them.