History of the Peloponnesian War

Meanwhile they pushed on more actively than ever with the wall in Eetionia. Now the meaning of this wall, according to Theramenes and his supporters, was not so much to keep out the army of Samos in case of its trying to force its way into Piraeus as to be able to let in, at pleasure, the fleet and army of the enemy.

For Eetionia is a mole of Piraeus, close alongside of the entrance of the harbour, and was now fortified in connection with the wall already existing on the land side, so that a few men placed in it might be able to command the entrance; the old wall on the land side and the new one now being built within on the side of the sea, both ending in one of the two towers standing at the narrow mouth of the harbour.

They also walled off the largest porch in Piraeus which was in immediate connection with this wall, and kept it in their own hands, compelling all to unload there the corn that came into the harbour, and what they had in stock, and to take it out from thence when they sold it.