History of the Peloponnesian War

The Peloponnesians also set up a trophy, as if they also had had the victory, in respect of the flight of those galleys which they sunk by the shore; and the galley which they had taken they consecrated to Neptune in Rhium of Achaia, hard by their trophy.

After this, fearing the supply which was expected from Athens, they sailed by night into the Crisaean gulf and to Corinth, all but the Leucadians.

And those Athenians with twenty galleys out of Crete, that should have been with Phormio before the battle, not long after the going away of the galleys of Peloponnesus arrived at Naupactus. And the summer ended.

But before the fleet, gone into the Crisaean gulf and to Corinth, was dispersed, Cnemus and Brasidas and the rest of the commanders of the Peloponnesians in the beginning of winter instructed by the Megareans thought good to make an attempt upon Peiraeus, the haven of the Athenians. Now it was without guard or bar, and that upon very good cause, considering how much they exceeded others in the power of their navy.

And it was resolved that every mariner with his oar, his cushion, and one thong for his oar to turn in should take his way by land from Corinth to the other sea that lieth to Athens and, going with all speed to Megara, launch forty galleys out of Nisaea, the arsenal of the Megareans, which then were there, and sail presently into Peiraeus.

For at that time there neither stood any galleys for a watch before it, nor was there any imagination that the enemies would on such a sudden come upon them; for they durst not have attempted it openly, though with leisure; nor if they had had any such intention, could it but have been discovered.