Leaving a garrison behind, the Greeks invaded Illyria itself. The Illyrians defenders were only slightly less
numerous than the invaders and had field forts built at stragetic passes, while the feared Achaean heavy
infantry, armed with long spears, was at a disadvantage in the rugged wilderness terrain. Despite Artemon's
inspired leadership his army was thrown back, taking more than double the
losses of the Illyrians. Furious at the check but realizing the majority of his army was walking wounded, he
had sense to retreat back to Dalmatia so his forces could lick their wounds and plan their next move.