There he heard that Mindarus the Spartan admiral had sailed off to the Hellespont with his entire fleet, followed by the Athenians, and so he hastened to the assistance of their generals. By chance he came up, with his eighteen triremes, at just that critical point when both parties, having joined battle with all their ships off Abydos, and sharing almost equally in victory and defeat until evening, were locked in a great struggle.
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).