 The Isanzu were also hostile to the Hadza at times, and may have captured them for the slave trade until as late as the 1870s (when it was halted by the German colonial government).Later interaction was more peaceable, with the two peoples sometimes intermarrying and residing together, though as late as 1912, the Hadza are reported as being "ready for war" with the Isanzu.The Sukuma and the Hadza also had a more amiable relationship; the Sukuma drove their herds and salt caravans through Hadza lands, and exchanged old metal tools, which the Hadza made into arrowheads, for the right to hunt elephants in Hadzaland.