But after he had taken a great number of cities and two thousand Macedonian soldiers had come over to him, he began to hope for greater things, and set out to attack Antigonus, and falling upon him in a narrow pass, threw his whole army into confusion.
Edition :
Plutarch Lives IX: Demetrius and Antony, Pyrrhus and Caius Marius, Ed. Jeffrey Henderson, trans. Bernadotte Perrin (The Loeb Classical Library 101), Harvard University Press: Cambridge/MA - London 1968 (first ed. 1920).
Remark :
date: The date is taken from the New Pauly.
http://referenceworks.brillonline.com/entries/brill-s-new-pauly/pyrrhus-e1015710