While Mycalessus thus experienced a calamity for its extent as lamentable as any that happened in the war, Demosthenes, whom we left sailing to Corcyra, after the building of the fort in Laconia, found a merchantman lying at Phea in Elis, in which the Corinthian heavy infantry were to cross to Sicily. The ship he destroyed, but the men escaped, and subsequently got another in which they pursued their voyage. After this, arriving at Zacynthus and Cephallenia, he took a body of heavy infantry on board, and sending for some of the Messenians from Naupactus, crossed over to the opposite coast of Acarnania, to Alyzia, and to Anactorium which was held by the Athenians. While he was in these parts he was met by Eurymedon returning from Sicily, where he had been sent, as has been mentioned, during the winter, with the money for the army, who told him the news, and also that he had heard, while at sea, that the Syracusans had taken Plemmyrium. Here, also, Conon came to them, the commander at Naupactus, with news that the twenty-five Corinthian ships stationed opposite to him, far from giving over the war, were meditating an engagement; and he therefore begged them to send him some ships, as his own eighteen were not a match for the enemy's twenty-five. Demosthenes and Eurymedon, accordingly, sent ten of their best sailers with Conon to reinforce the squadron at Naupactus, and meanwhile prepared for the muster of their forces; Eurymedon, who was now the colleague of Demosthenes, and had turned back in consequence of his appointment, sailing to Corcyra to tell them to man fifteen ships and to enlist heavy infantry; while Demosthenes raised slingers and darters from the parts about Acarnania.
Meanwhile the envoys, already mentioned, who had gone from Syracuse to the cities after the capture of Plemmyrium, had succeeded in their mission, and were about to bring the army that they had collected, when Nicias got scent of it, and sent to the Centoripae and Alicyaeans and other of the friendly Sicels, who held the passes, not to let the enemy through, but to combine to prevent their passing, there being no other way by which they could even attempt it, as the Agrigentines would not give them a passage through their country. Agreeably to this request the Sicels laid a triple ambuscade for the Siceliots upon their march, and attacking them suddenly, while off their guard, killed about eight hundred of them and all the envoys, the Corinthian only excepted, by whom fifteen hundred who escaped were conducted to Syracuse.
About the same time the Camarinaeans also came to the assistance of Syracuse with five hundred heavy infantry, three hundred darters, and as many archers, while the Geloans sent crews for five ships, four hundred darters, and two hundred horse. Indeed almost the whole of Sicily, except the Agrigentines, who were neutral, now ceased merely to watch events as it had hitherto done, and actively joined Syracuse against the Athenians.
While the Syracusans after the Sicel disaster put off any immediate attack upon the Athenians, Demosthenes and Eurymedon, whose forces from Corcyra and the continent were now ready, crossed the Ionian Gulf with all their armament to the Iapygian promontory, and starting from thence touched at the Choerades Isles lying off Iapygia, where they took on board a hundred and fifty Iapygian darters of the Messapian tribe, and after renewing an old friendship with Artas the chief, who had furnished them with the darters, arrived at Metapontium in Italy. Here they persuaded their allies the Metapontines to send with them three hundred darters and two galleys, and with this reinforcement coasted on to Thurii, where they found the party hostile to Athens recently expelled by a revolution, and accordingly remained there to muster and review the whole army, to see if any had been left behind, and to prevail upon the Thurians resolutely to join them in their expedition, and in the circumstances in which they found themselves to conclude a defensive and offensive alliance with the Athenians.
About the same time the Peloponnesians in the twenty-five ships stationed opposite to the squadron at Naupactus to protect the passage of the transports to Sicily had got ready for engaging, and manning some additional vessels, so as to be numerically little inferior to the Athenians, anchored off Erineus in Achaia in the Rhypic country.
The place off which they lay being in the form of a crescent, the land forces furnished by the Corinthians and their allies on the spot came up and ranged themselves upon the projecting headlands on either side, while the fleet, under the command of Polyanthes, a Corinthian, held the intervening space and blocked up the entrance.
The Athenians under Diphilus now sailed out against them with thirty-three ships from Naupactus, and the Corinthians, at first not moving, at length thought they saw their opportunity, raised the signal, and advanced and engaged the Athenians. After an obstinate struggle, the Corinthians lost three ships, and without sinking any altogether, disabled seven of the enemy, which were struck prow to prow and had their foreships stove in by the Corinthian vessels, whose cheeks had been strengthened for this very purpose. After an action of this even character, in which either party could claim the victory (although the Athenians became masters of the wrecks through the wind driving them out to sea, the Corinthians not putting out again to meet them), the two combatants parted. No pursuit took place, and no prisoners were made on either side; the Corinthians and Peloponnesians who were fighting near the shore escaping with ease, and none of the Athenian vessels having been sunk. The Athenians now sailed back to Naupactus, and the Corinthians immediately set up a trophy as victors, because they had disabled a greater number of the enemy's ships.