 Among them were groups led by Raja Asal, the overlord of the Mandailings, and his nephew Raja Bilah.Together with Sutan Puasa, they were embroiled in the Klang War from 1866 to 1873, also known as the Selangor War.Raja Asal and Raja Bilah fled to Perak, where their followers settled in Lower Perk and the Kinta Valley.