His companions were thrown into confusion around him, and the Spartans, running upon them and making good use of their missiles, drove them all off.
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 :
perpetrator: The Spartans gain enough time for the aiding forces to arrive. This victory is mentioned in 29.6. date: The date is taken from the New Pauly.
http://referenceworks.brillonline.com/entries/brill-s-new-pauly/pyrrhus-e1015710 application: It is safe to assume Plutarch meant arrows as well as javelins with "missiles".