Excerpts from Books and Wikipedia
King Shaka was admired because he transformed a Zulu clan in southern Africa into a fighting force of 250,000. He was despised because of his cruelty. Dingane, his successor, was defeated at Blood River in 1838. Cetawayo, his nephew, was defeated by the British at Ulundi in 1879. [Furtado: 1001 Days] "After Shaka's assassination by his half-brothers, Afrikaner migration north accelerated, notably in the 'Great Trek' starting in 1836, defeating and dispersing the Zulu and Nguni tribes in their path." [DK Timelines, p. 350]