Wikipedia
Mfecane (, crushing), also known by the Sesotho name Difaqane (scattering, forced dispersal or forced migration) or Lifaqane, was a period of widespread chaos and warfare among indigenous ethnic communities in :southern Africa during the period between 1815 and about 1840.
As King Shaka created the militaristic Zulu Kingdom in the territory between the Tugela River and Pongola River, his forces caused a wave of warfare and disruption to sweep to other peoples. This was the prelude of the Mfecane, which spread from there. The movement of people caused many tribes to try to dominate those in new territories, leading to widespread warfare; consolidation of other groups, such as the Matabele, the Mfengu and the Makololo; and the creation of states such as the modern Lesotho.
Mfecane is used primarily to refer to the period when Mzilikazi, a king of the Matabele, dominated the Transvaal. During his reign, roughly from 1826 to 1836, he ordered widespread killings and devastation to remove all opposition. He reorganised the territory to establish the new Ndebele order. The death toll has never been satisfactorily determined, but the whole region became nearly depopulated. Normal estimates for the death toll range from 1 million to 2 million. These numbers are however controversial.