This caused mass displacements, wars and raids throughout Southern, Central and Eastern Africa as Nguni or Ngoni tribes made their way throughout the region and is referred to as the Mfecane. The arriving Nguni under the leadership of Zwagendaba crossed the Zambezi river moving northwards. The Ngoni were the final blow to the already weakened Maravi Empire. Many Nguni eventually settled around what is today Zambia, Malawi, Mozambique and Tanzania and assimilated into neighbouring tribes.