His "buffalo  horns" formation was used at the Battle of Isandhlwana, and he systematized the impi.
This man phased out the use of the assegai, replacing it with the shorter iklwa. Upon his  mother Nandi's death, he ordered 7000 people executed for not expressing enough grief. He  succeeded Dingiswayo and united the Nguni people, and led his armies south, causing the chaos  known as Mfecane. He was assassinated and succeeded by his half-brother Dingane. His "buffalo  horns" formation was used at the Battle of Isandhlwana, and he systematized the impi. For 10  points, identify this founder of the Zulu kingdom in the 19th century.
This man phased out the use of the assegai, replacing it with the shorter iklwa.
Shaka Zulu or Shaka kaSenzangakhona