After a three-day truce, Alexander found the Taulantii camp unguarded and defeated the Illyrians under the cover of night.
[2] Unlike Grabos II and Pleurias - Pleuratus, the designation "king of the Illyrians" never appears next to Cleitus in Arrian.
[2] Cleitus was one of the three Illyrian kings who attempted to gain lost territory and thwart Macedonian power in a revolt.
During Alexander's Balkan campaigns, alarming reports began to come from Illyria that the Illyrians had revolted and were poised to invade Macaedonia.
The ancient historian Arrian states that Cleitus sacrificed three boys, three girls, and three black rams on an altar just before the Battle of Pelion with Alexander.
The Macedonians had no time in starving Cleitus out, and with so small a task force, their chances of taking the strongly guarded city fortress by storm were minimal.
A foraging party under the Macedonian general Philotas barely escaped annihilation thanks to quick action by Alexander and the cavalry.
Early next morning, he formed up his entire army in the plain, apparently oblivious to the presence of Cleitus and the newly arrived Glaucias, and gave an exhibition of close-order drill.
Alexander's cavalry and light-armed troops held them off from the knoll long enough for his siege catapults to be carried through the ford and set up on the further bank.
The Illyrian camp lay wide open because of indiscipline; Glaucias dug no trenches and built no palisades, not even bothering to post sentries.
Cleitus did not regroup his forces, so the Illyrians remained on amicable terms with Macedonia for the rest of Alexander's reign.
The year of Cletius' death is not known, but he was succeeded to the throne by his son Bardyllis II around 300–295 BC, although it is unlikely that he ruled that long.