he also wasted much territory, and advanced until he was within three hundred furlongs' distance from Rome.
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. This happened directly after his victory at Heraclea. http://referenceworks.brillonline.com/entries/brill-s-new-pauly/pyrrhus-e1015710