An important document in the Dutch Archives casts new light on the Kongo–Portuguese War of 1622, usually seen as a signal defeat for Kongo. This document shows that, after the Portuguese victory over Kongo at the Battle of Mbumbi, there was a second battle in which Kongo forces were victorious, and they in fact began the process of re-occupying lands the Portuguese had absorbed in earlier expansion. In addition, the document reveals the origins of a plan, conceived in Kongo, to form an alliance with the Dutch in order to attack Luanda and drive the Portuguese from Angola, a plan that was realized not in 1624 but in 1641.