Lord Chelmsford, the British officer who commanded during the Anglo-Zulu War, vastly underestimated the power and aggression of the Zulu people. He split his army into three separate columns and left one of them stationed at Isandlwana while he searched for Zulu armies on the field. Meanwhile 20,000 Zulus were already flanking his force, but because Lord Chelmsford had not even ordered them to fortify the camp, the Zulu force swept through the ranks and destroyed the British army at Isandlwana. A small group of survivors fled to the hospital at Rorke's Drift where officer James Dalton organized a desperate defense. Cetshwayo's half-brother, ignoring orders to halt his pursuit, stormed the hospital with his small force and lost disastrously. Despite this, the main Zulu army continued to hand defeats to the British army until finally the British government stepped in to reinforce them with artillery and extra soldiers. Finally, Great Britain succeeded in capturing both the Zulu capitol at Ulundi and King Cetshwayo himself. They divided Zulu territory into 12 small kingdoms that quickly fell into civil war. Out of desperation, they returned Cetshwayo to the throne, but too late: a rival attacked and killed him. His son Dinuzulu allied with the Boers in an attempt to regain power and independence, but the British seized this excuse to finally annex Zulu land for good in 1887.