This would form a defensive buffer against any future Illyrian raids attempted through the Drilon Valley.
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The armies met in battle on a plain in the Erigon Valley near Bitola, just south of the Drdanian State.
Dionysus wanted a friendly monarch in Epirus, so he sent 2,000 Greek hoplites and 500 suits of Greek armour to help the Illyrians under Bardyllis in attacking the Molossians of Epirus.
After the battle, Bardyllis was said to have briefly held Philip II, the youngest brother of Alexander II, as a hostage.