History of the Peloponnesian War

About the end of the autumn of this summer the Athenians, both themselves and the strangers that dwelt amongst them, with the whole power of the city, under the conduct of Pericles the son 31antippus, invaded the territory of Megara. And those Athenians likewise that had been with the hundred galleys about Peloponnesus, in their return, being now at Aegina, hearing that the whole power of the city was gone into Megaris, went and joined them.

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.