History of the Peloponnesian War

For the Syracusan ships that were fighting in front of the entrance, after they had forced back the Athenian ships, sailed into the harbour in disorder, and falling foul of one another made a present of their victory to the Athenians, who routed not only this squadron but also the ships by which they were at first being beaten inside the harbour.

And they sank eleven of the Syracusan ships, slaying most of the men, except only the crews of three ships, whom they took alive; but of their own ships three were destroyed. And drawing up on shore the wrecks of the Syracusan ships and setting up a trophy on the little island that faces Plemmyrium, they withdrew to their own camp.

The Syracusans had fared thus in the sea-fight, but they held possession of the forts on Plemmyrium and set up three trophies for these. One of the two forts last taken they demolished, but the other two they repaired and garrisoned.