Neither of these Portuguese settlement efforts was launched for the purpose of territorial conquest. It is true that both gradually came to occupy and farm a broad area around their initial bridgeheads (in the case of Luanda, mostly along the lower Kwanza River). However, their main function was trade – overwhelmingly the slave trade. Slaves were bought from African intermediaries and sold to Portuguese colonies in Brazil and the Caribbean. In addition, Benguela developed a commerce in ivory, wax, and honey, which they bought from Ovimbundu caravans which fetched these goods from among the Ganguela peoples in the eastern part of what is now Angola.