Battle of Waterberg
1904 CE.
Shown on the map at -20.477°, 17.308°.
The Battle of Waterberg (Battle of Ohamakari) took place on August 11, 1904, at the Waterberg, German South West Africa (modern day Namibia), and was the decisive battle in the Herero uprising.
Text from the Wikipedia article Battle of Waterberg, licensed CC BY-SA 4.0.