Raja Abdullah and Raja Juma'at, who had opened very successful tin mines in Lukut (near today's Port Dickson, Negeri Sembilan), obtained funding for the exploration of new tin mines near Kuala Lumpur, at the confluence of the rivers Klang and Gombak, in 1857. The new mines were successful, generating considerable revenue, and the struggle for the control of the revenues from the tin mines, as well as political power, were essentially the triggers for the war.[3]