Rentap had gathered all the Iban Dayaks from along the Skrang River who were faithful to him, and those in the upper Saribas River who offered him aid so long as he occupied Sadok Hill. Rentap was given the title "Raja Ulu" (King of Upriver), and Sadok Hill became the centre of all opposition to the rule of the White Rajah. The fort stood as an unapproachable centre far-removed from danger and a sanctuary to which they could all retire in case of need.