The Peloponnesians, Boeotians and Megarians who were in garrison at Byzantium routed the ships' crews and drove them back on board again. Then, perceiving that the Athenians were inside the city, they formed in battle array and advanced to attack them. A fierce battle followed, but Alcibiades was victorious with the right wing, as well as Theramenes with the left, and they took prisoners no less than three hundred of the enemy who survived.
Edition :
Plutarch Lives IV: Alcibiades and Coriolanus, Lysander and Sulla, Ed. Jeffrey Henderson, trans. Bernadotte Perrin (The Loeb Classical Library 80), Harvard University Press: Cambridge/MA - London 2000 (first ed. 1916).