Demetrius therefore made an expedition against the Aetolians and conquered them,
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 :
long-term consequence: Demetrius leaves Pantauchus in Aetolia with a large force who is attacked by Pyrrhus while Demetrius is in Epirus. This is mentioned later in the paragraph.