In the second place, he came to the aid of the citizens of Byzantium and Perinthus when the Macedonian was making war upon them, by persuading the Athenian people to remit their hatred and forget the wrongs committed by each of these cities in the Social War, and to send them a force,—the force which saved them.
Edition :
Plutarch Lives VII: Demosthenes and Cicero, Alexander and Caesar, Ed. Jeffrey Henderson, trans. Bernadotte Perrin (The Loeb Classical Library 99), Harvard University Press: Cambridge/MA - London 1967 (first ed. 1919).