To the east, in December 1897 a group of the Angoni or Ngoni (originally from Zululand) rebelled under Tsinco, son of King Mpezeni, but the rebellion was put down, and Mpezeni accepted the Pax Britannica. That part of the country then came to be known as North-Eastern Rhodesia. In 1895, Rhodes asked his American scout Frederick Russell Burnham to look for minerals and ways to improve river navigation in the region, and it was during this trek that Burnham discovered major copper deposits along the Kafue River.