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.

In the meantime the Lacedaemonians prepared for their invasion of Attica, in accordance with their own previous resolve, and at the instigation of the Syracusans and Corinthians, who wished for an invasion to arrest the reinforcements which they heard that Athens was about to send to Sicily. Alcibiades also urgently advised the fortification of Decelea, and a vigorous prosecution of the war.

But the Lacedaemonians derived most encouragement from the belief that Athens, with two wars on her hands, against themselves and against the Siceliots, would be more easy to subdue, and from the conviction that she had been the first to infringe the truce. In the former war, they considered, the offence had been more on their own side, both on account of the entrance of the Thebans into Plataea in time of peace, and also of their own refusal to listen to the Athenian offer of arbitration, in spite of the clause in the former treaty that where arbitration should be offered there should be no appeal to arms. For this reason they thought that they deserved their misfortunes, and took to heart seriously the disaster at Pylos and whatever else had befallen them.

But when, besides the ravages from Pylos, which went on without any intermission, the thirty Athenian ships came out from Argos and wasted part of Epidaurus, Prasiae, and other places; when upon every dispute that arose as to the interpretation of any doubtful point in the treaty, their own offers of arbitration were always rejected by the Athenians,—the Lacedaemonians at length decided that Athens had now committed the very same offence as they had before done, and had become the guilty party; and they began to be full of ardor for the war.