Herdsmen found their lands being taken over by the Germans in SW Africa and attacked German settlers over a period of time. In “return” the Germans massacred 4/5 of the population.
Herero Genocide
German forces massacred ~80% of the Herero population after land conflict.

Herero-fanger under folkemordet. Av Ukjent fotograf. Falt i det fri (Public domain)