Cassander advised the Acarnanians to abandon their scattered unfortified villages and move into larger cities, where they would be able to defend themselves in case of an attack. Some Acarnanians chose Agrinium but it proved no match for the determination of the Aetolians. Their army (3000 men) invested the city and laid siege to it. The Acarnanians resisted for a while but eventually they agreed to surrender the city and depart under safe conduct. Their trust in the truce was misplaced though, for as they were marching away, the Aetolians attacked them and killed all but a few of them. Agrinium, despite its great strategic value, never managed to become an important city in antiquity.