Between 1904 and 1908, Germany’s colonial forces reacted to a rebellion by Ovaherero and Nama people in Namibia with brutal violence and prison camps. The trauma and political repercussion remain unresolved.
Archived version: https://archive.ph/h52to
It is a often forgotten low point in German history but during the colonization of Africa the Germans were extremely cruel. The German Empire employed a extrem scorched earth strategy against the rebelion of the maji maji people, in modern day Tanzania. Which led to an extreme famine cause by it.
https://en.m.wikipedia.org/wiki/Maji_Maji_Rebellion