During the first half of the 1600s, when Portugal became involved in a succession of European religious and dynastic wars at the insistence of its ally, Spain, the Portuguese colonies were subjected to attacks by Spain's enemies. Holland, one of Spain's most potent enemies, raided and harassed the Portuguese territories in Angola. The Dutch also began pursuing alliances with Africans, including the king of Kongo and Nzinga of Matamba, who, angered by their treatment at the hands of the Portuguese, welcomed the opportunity to deal with another European power.

When it rebelled against Spain in 1640, Portugal hoped to establish good relations with the Dutch. Instead, the Dutch saw an opportunity to expand their own colonial holdings and in 1641 captured Luanda and Benguela, forcing the Portuguese governor to flee with his fellow refugees inland to Massangano. The Portuguese were unable to dislodge the Dutch from their coastal beachhead. As the Dutch occupation cut off the supply of slaves to Brazil, that colony's economy suffered. In response, Brazilian colonists raised money and organized forces to launch an expedition aimed at unseating the Dutch from Angola. In May 1648, the Dutch garrison in Luanda surrendered to the Brazilian detachment, and the Dutch eventually relinquished their other Angolan conquests. According to some historians, after the retaking of Luanda, Angola became a de facto colony of Brazil, so driven was the South American colony's sugar-growing economy by its need for slaves.

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Source: U.S. Library of Congress