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In page History of the Republic of the Congo:

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The result was a series of revolts against Portuguese rule of which the battle of Mbwila and the revolt led by Kimpa Vita (Tchimpa Vita) were the most important. The battle of Mbwila (or battle of Ambouilla or battle of Ulanga) was the result of a conflict between the Portuguese, led by governor André Vidal de Negreiros, and the Kongolese king António I concerning mining rights. The Kongolese refused to give the Portuguese extra territorial rights and the Portuguese were angry because of Kongolese support for previous Dutch invasions of the region. During a battle on 25 October 1665 an estimated 20,000 Kongolese fought against the Portuguese, who won the battle thanks to the early death in battle of Kongolese King Afonso I of Kongo.[citation needed]