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Portuguese forces and their Imbangala allies defeated the Kongo army at the Battle of Mbumbi.

Imbangala

Angolan people

The Imbangala or Mbangala were divided groups of warriors and marauders who worked as hired mercenaries in 17th-century Angola and later founded the Kasanje Kingdom.
Source: Wikipedia (CC BY-SA)

Kingdom of Kongo

1390–1914 state in Central Africa; Portuguese vassal from 1857

The Kingdom of Kongo was a kingdom in Central Africa. It was located in present-day northern Angola, the western portion of the Democratic Republic of the Congo, southern Gabon and the Republic of the Congo. At its greatest extent it reached from the Atlantic Ocean in the west…
Source: Wikipedia (CC BY-SA)

Battle of Mbumbi

1622 Portuguese victory over Kongo in Angola

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.
Source: Wikipedia (CC BY-SA)