The allied Imbangala , mercenary soldiers from south of the Kwanza River , turned the day .
The allied Imbangala , mercenary soldiers from south of the Kwanza River , allowed Mendes de Vasconcelos ' forces to sack Ndongo 's capital and pillage the country .
The allied Imbangala , mercenary soldiers from south of the Kwanza River , turned the day and allowed Mendes de Vasconcelos ' forces to sack Ndongo 's capital and pillage the country .