In 1642, the Dutch sent troops to help Garcia II put down an uprising by peoples of the southern district in the Dembos region. The government quickly put down the Nsala rebellion, reaffirming the Kongo-Dutch alliance. King Garcia II paid the Dutch for their services in slaves taken from ranks of Dembos rebels. These slaves were sent to Pernambuco, Brazil where the Dutch had taken over a portion of the Portuguese sugar-producing region. A Dutch-Kongo force attacked Portuguese bases on the Bengo River in 1643 in retaliation for Portuguese harassment. The Dutch captured Portuguese positions and forced their rivals to withdraw to Dutch forts on the Kwanza River at Muxima and Masangano. Following this victory, the Dutch once again appeared to lose interest in conquering the colony of Angola.