History of the Peloponnesian War

They began at once to close up the Great Harbor by means of boats, merchant vessels, and galleys moored broadside across its mouth, which is nearly a mile wide, and made all their other arrangements for the event of the Athenians again venturing to fight at sea. There was, in fact, nothing little either in their plans or their ideas.

The Athenians, seeing them closing up the harbor and informed of their further designs, called a council of war.

The generals and colonels assembled and discussed the difficulties of the situation; the point which pressed most being that they no longer had provisions for immediate use (having sent on to Catana to tell them not to send any, in the belief that they were going away), and that they would not have any in future unless they could command the sea. They therefore determined to evacuate their upper lines, to enclose with a cross-wall and garrison a small space close to the ships, only just sufficient to hold their stores and sick, and manning all the ships, seaworthy or not, with every man that could be spared from the rest of their land forces, to fight it out at sea, and if victorious, to go to Catana, if not, to burn their vessels, form in close order, and retreat by land for the nearest friendly place they could reach, Hellenic or barbarian.