History of the Peloponnesian War

Upon their arrival at Athens, the Athenians banished Pythodorus and Sophocles, and fined Eurymedon for having taken bribes to depart when they might have subdued Sicily.

So thoroughly had the present prosperity persuaded the citizens that nothing could withstand them, and that they could achieve what was possible and impracticable alike, with means ample or inadequate it mattered not. The secret of this was their general extraordinary success, which made them confuse their strength with their hopes.

The same summer the Megarians in the city, pressed by the hostilities of the Athenians, who invaded their country twice every year with all their forces, and harassed by the incursions of their own exiles at Pegae, who had been expelled in a revolution by the popular party, began to ask each other whether it would not be better to receive back their exiles, and free the town from one of its two scourges.

The friends of the emigrants perceiving the agitation, now more openly than before demanded the adoption of this proposition;

and the leaders of the commons, seeing that the sufferings of the times had tired out the constancy of their supporters, entered in their alarm into correspondence with the Athenian generals, Hippocrates, son of Ariphron, and Demosthenes, son of Alcisthenes, and resolved to betray the town, thinking this less dangerous to themselves than the return of the party which they had banished. It was accordingly arranged that the Athenians should first take the long walls extending for nearly a mile from the city to the port of Nisaea, to prevent the Peloponnesians coming to the rescue from that place, where they formed the sole garrison to secure the fidelity of Megara; and that after this the attempt should be made to put into their hands the upper town, which it was thought would then come over with less difficulty.