In the next--the fifth--summer, Mitylene capitulated; the fate of the inhabitants was to be referred to Athens. Here Cleon had now become the popular leader, and he persuaded the Athenians to order the whole of the adult males to be put to death. The opposition, however, succeeded in getting this bloodthirsty resolution rescinded. The second dispatch, racing desperately after the first, did not succeed in overtaking it, but was just in time to prevent the order for the massacre from being carried out. Lesbos was divided among Athenian citizens, who left the Lesbians in occupation as before, but drew a large rental from them.
In the same summer the remaining garrison of Platæa surrendered to the Lacedæmonians, on terms to be decided by Lacedæmonian commissioners. Before them the Platæans justified their resistance, but the commissioners ignored the defence, and, on the pretext that the only question was whether they had suffered any "wrong" at the hands of the Platæans, and that the answer to that was obvious, put the Platæans to death and razed the city to the ground.
Meanwhile, at Corcyra, the popular and the oligarchical parties, who favoured the Athenians and Peloponnesians respectively, had reached the stage of murderous hostility to each other. The oligarchs captured the government, and were then in turn attacked by the popular party; and there was savage faction fighting. An attempt was made by the commander of the Athenian squadron at Naupactus to act as moderator; the appearance of a Peloponnesian squadron and a confused sea-fight, somewhat in favour of the latter, brought the popular party to the verge of a compromise. But the Peloponnesians retired on the reported approach of a fresh Athenian fleet, and a democratic reign of terror followed.
"The father slew the son, and the supplicants were torn from the temples and slain near them." And thus was initiated the peculiar horror of this war--the desperate civil strife in one city after another, oligarchs hoping to triumph by Lacedæmonian and democrats by Athenian, support, and either party, when uppermost, ruling by terror. It was at this time also that the Ionian and Dorian cities of Sicily, headed by Leontini and Syracuse respectively, went to war with each other, and an Athenian squadron was first induced to participate in the struggle.
Among the operations of the next, or sixth, summer was a campaign which the Athenian commander Demosthenes conducted in Ætolia--successful at the outset, but terminating in disaster, which made the general afraid to return to Athens. He seized a chance, however, of recovering his credit by foiling a Lacedæmonian expedition against Naupactus; and in other ways he successfully established a high military reputation, so that he was no longer afraid to reappear at Athens.
Next year, the Athenians dispatched a larger fleet with Sicily for its objective. Demosthenes, however, who had a project of his own in view, was given an independent command. He was thus enabled to seize and fortify Pylos, a position on the south-west of Peloponnese, with a harbour sheltered by the isle of Sphacteria. The Spartans, in alarm, withdrew their invading force from Attica, and attempted to recover Pylos, landing over 400 of their best men on Sphacteria. The locality now became the scene of a desperate struggle, which finally resulted in the Spartans on Sphacteria being completely isolated.
So seriously did the Lacedæmonians regard this blow that they invited the Athenians to make peace virtually in terms of an equal alliance; but the Athenians were now so confident of a triumphant issue that they refused the terms--chiefly at the instigation of Cleon. Some supplies, however, were got into Sphacteria, owing to the high rewards offered by the Lacedæmonians for successful blockade-running. At this moment, Cleon, the Athenian demagogue, having rashly declared that he could easily capture Sphacteria, was taken at his word and sent to do it. He had the wit, however, to choose Demosthenes for his colleague, and to take precisely the kind of troops Demosthenes wanted; with the result that within twenty days, as he had promised, the Spartans found themselves with no other alternatives than annihilation or surrender. Their choice of the latter was an overwhelming blow to Lacedæmonian prestige.
III.--Victories of Lacedæmon
The capture of the island of Cythera in the next summer gave the Athenians a second strong station from which they could constantly menace the Peloponnese. On the other hand, in this year the Sicilians were awakening to the fact that Athens was not playing a disinterested part on behalf of the Ionian states, but was dreaming of a Sicilian empire. At a sort of peace congress, Hermocrates of Syracuse successfully urged all Sicilians to compose their quarrels on the basis of uti possidetis, and thus deprive the Athenians of any excuse for remaining. Thus for the time Athenian aspirations in that quarter were checked.
At Megara this year the dissensions of the oligarchical and popular factions almost resulted in its capture by the Athenians. The Lacedæmonian Brasidas, however--who had distinguished himself at Pylos--effected an entry, so that the oligarchical and Peloponnesian party became permanently established in power. The most important operations were now in two fields. Brasidas made a dash through Thessaly into Macedonia, in alliance with Perdiccas of Macedon, with the hope of stirring the cities of Chalcidice to throw off the Athenian yoke; and the democrats of Boeotia intrigued with Athens to assist in a general revolution. Owing partly to misunderstandings and partly to treachery, the Boeotian democrats failed to carry out their programme, the Athenians were defeated at Delium, and Delium itself was captured by the Boeotians.