Thus the summer ended. Winter was now at hand; but before dispersing the fleet, which had retired to Corinth and the Crissaean gulf, Cnemus, Brasidas, and the other Peloponnesian captains allowed themselves to be persuaded by the Megarians to make an attempt upon Piraeus, the port of Athens, which from her decided superiority at sea had been naturally left unguarded and open.

Their plan was as follows:—The men were each to take their oar, cushion, and rowlock thong, and going overland from Corinth to the sea on the Athenian side, to get to Megara as quickly as they could, and launching forty vessels, which happened to be in the docks at Nisaea, to sail at once to Piraeus.

There was no fleet on the look-out in the harbor, and no one had the least idea of the enemy attempting a surprise; while an open attack would, it was thought, never be deliberately ventured on or if in contemplation, would be speedily known at Athens. Their plan formed, the next step was to put it in execution.

Arriving by night and launching the vessels from Nisaea, they sailed, not to Piraes as they had originally intended, being afraid of the risk, besides which there was some talk of a wind having stopped them, but to the point of Salamis that looks towards Megara; where there was a fort and a squadron of three ships to prevent anything sailing in or out of Megara. This fort they assaulted, and towed off the galleys empty, and surprising the inhabitants began to lay waste the rest of the island.