Pyrrhus himself, then, with his men-at-arms, tried to force his way directly against the many shields of the Spartans which confronted him, and over a trench which was impassable and afforded his soldiers no firm footing owing to the freshly turned earth.
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