History of the Peloponnesian War

And this was the greatest army that ever the Athenians had together in one place before, the city being now in her strength and the plague not yet amongst them. For the Athenians themselves were no less than ten thousand men of arms, besides the three thousand at Potidaea; and the strangers that dwelt amongst them and accompanied them in this invasion were no fewer than three thousand men of arms more, besides other great numbers of lightarmed soldiers.

And when they had wasted the greatest part of the country, they went back to Athens. And afterwards, year after year during this war the Athenians often invaded Megaris, sometimes with their horsemen and sometimes with their whole army, until such time as they had won Nisaea.

Also in the end of this summer they fortified Atalante, an island lying upon the Locrians of Opus, desolate till then, for a garrison against thieves, which passing over from Opus and other parts of Locris might annoy Euboea. These were the things done this summer after the retreat of the Peloponnesians out of Attica.