Concept: The Battle of Blood River was a clash between the Boers and the Zulu kingdom during the Great Trek.Explanation: The Battle of Blood River took place on 16 December 1838 in South Africa.It was fought between the Voortrekkers (Boers) and the Zulu forces led by King Dingane.The Boers, under Andries Pretorius, defeated the Zulu army.The name “Blood River” refers to the water turning red from the bloodshed.The Zulus were the indigenous group involved in this battle.Answer: C. The Zulus