This was not the only maritime expedition of the summer. Thirty more triremes, under Cleopompus, were sent through the Euripus to the Locrian coast opposite to the northern part of Eubœa. Some disembarkations were made, whereby the Locrian towns of Thronium and Alope were sacked, and further devastation inflicted; while a permanent garrison was planted, and a fortified post erected, in the uninhabited island of Atalante opposite to the Locrian coast, in order to restrain privateers from Opus and the other Locrian towns in their excursions against Eubœa. It was further determined to expel the Æginetan inhabitants from Ægina, and to occupy the island with Athenian colonists. This step was partly rendered prudent by the important position of the island midway between Attica and Peloponnesus. But a concurrent motive, and probably the stronger motive, was the gratification of ancient antipathy and revenge against a people who had been among the foremost in provoking the war and in inflicting upon Athens so much suffering. The Æginetans, with their wives and children, were all put on ship-board and landed in Peloponnesus, where the Spartans permitted them to occupy the maritime district and town of Thyrea, their last frontier towards Argos; some of them, however, found shelter in other parts of Greece. The island was made over to a detachment of Athenian cleruchs, or citizen proprietors, sent hither by lot.
To the sufferings of the Æginetans, which we shall hereafter find still more deplorably aggravated, we have to add those of the Megarians. Both had been most zealous in kindling the war, but upon none did the distress of war fall so heavily. Both probably shared the premature confidence felt among the Peloponnesian confederacy, that Athens could never hold out more than a year or two, and were thus induced to overlook their own undefended position against her. Towards the close of September, the full force of Athens, citizens and metics, marched into the Megarid, under Pericles, and laid waste the greater part of the territory; while they were in it, the hundred ships which had been circumnavigating Peloponnesus, having arrived at Ægina on their return, joined their fellow citizens in the Megarid, instead of going straight home. The junction of the two formed the largest Athenian force that had ever yet been seen together; there were ten thousand citizen hoplites (independent of three thousand others who were engaged in the siege of Potidæa), and three thousand metic hoplites, besides a large number of light troops. Against so large a force the Megarians could make no head, so that their territory was all laid waste, even to the city walls. For several years of the war, the Athenians inflicted this destruction once, and often twice in the same year. A decree was proposed in the Athenian ecclesia by Charinus, though perhaps not carried, to the effect that the strategi every year should swear, as a portion of their oath of office, that they would twice invade and ravage the Megarid. As the Athenians at the same time kept the port of Nisæa blocked up, by means of their superior naval force and of the neighbouring coast of Salamis, the privations imposed on the Megarians became extreme and intolerable. Not only their corn and fruits, but even their garden vegetables were rooted up, and their situation was that of a besieged city pressed by famine. Even in the time of Pausanias, many centuries afterward, the miseries of the town during these years were remembered and communicated to him, being assigned as the reason why one of their most memorable statues had never been completed.