During the reign of Thrasamund, for unspecified reasons, the Vandals launched an expedition against Cabaon.
Although not himself a Christian, the Moorish leader then decided, according to Procopius, to send spies on the backs of the Vandals to repair the damage that the Arian fanatics would cause to the buildings of the worship.
The ensuing battle in an unknown place was a disaster for Thrasamund's troops, baffled by Berber tactics.
In a pattern that would be repeated later, they took shelter behind a rampart of camels and fought on foot, essentially making use of ranged weapons that decimated the Vandals squadrons.
The Byzantine compilers were fascinated by the paradoxical respect shown by Cabaon towards Catholic worship; the latter of which interested Evagrius, and led him to copy the passage from Procopius in his Ecclesiastical History.