History of the Peloponnesian War

The scope they had in this wall, as it was given out by Theramenes, [the son of Agnon], was not so much to keep out those of Samos in case they should attempt by force to enter into Peiraeus as at their pleasure to be able to let in both the galleys and the land forces of the enemies.

For this Eetioneia is the pier of the Peiraeus, close unto which is the mouth of the haven. And therefore they built this wall so to another wall that was built before to the continent that a few men lying within it might command the entrance. For the end of each wall was brought to the tower upon the [very] mouth of the haven, as well of the old wall towards the continent as of the new which was built within it to the water.

They built also an open ground-gallery, an exceeding great one and close to their new wall within Peiraeus, and were masters of it, and constrained all men as well to bring thither their corn which they had already come in, as to unload there whatsoever should come in afterward, and to take and sell it from thence.