When, however, Alexander had settled the affairs of his own country and came in person with his forces into Boeotia, prone lay the courage of the Athenians, and Demosthenes was extinguished, while the Thebans, betrayed by their allies, fought by themselves and lost their city.
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).