 This Zulu force was the 'loins' or reserve of the army at Isandlwana and is often referred to as the Undi Corps.It was directed to swing wide of the British left flank and pass west and south of Isandlwana hill itself, in order to position itself across the line of communication and retreat of the British and their colonial allies in order to prevent their escape back into Natal by way of the Buffalo River ford leading to Rorke's Drift.By the time the Undi Corps reached Rorke's Drift at 4