Battle of Mbumbi
1622 CE.
Shown on the map at -7.025°, 14.305°.
The Battle of Mbumbi was a military engagement between forces of Portuguese Angola and the Kingdom of Kongo in 1622. Although the Portuguese were victorious, the battle served as the impetus for the Kingdom of Kongo to expel the Portuguese from their territory.
Text from the Wikipedia article Battle of Mbumbi, licensed CC BY-SA 4.0.