Original:  The occupation by white settlers(Dutch and British) resulted in the century of Xhosa Wars (commonly known as the Frontier Wars) from 1779 to 1879 involving Xhosa tribes (including the Ngqika), Khoikhoi and San people.
Revised:  Encroachment by European settlers, beginning in the Dutch colonial period, resulted in the century of Xhosa Wars (commonly known as the Frontier Wars) from 1779 to 1879 involving Xhosa tribes (including the Ngqika), Khoikhoi and San people.
Edit intent: clarity