In 1844, Brooke's force attacked Batang Lupar, Batang Undop, and Batang Skrang to defeat the Malay sharifs and Dayak living in these regions. The Malay sharifs were easily defeated at Patusin in Batang Lupar, without a major fight despite their famous reputation and power over the native inlanders. However, during the battle of Batang Undop, one of Brooke's men, British Navy officer Mr. Charles Wade was killed in action at the battle of Ulu Undop while chasing the Malay sheriffs upriver. Subsequently, Brooke's Malay force headed by Datu Patinggi Ali and Mr. Steward was totally defeated by the Skrang Iban force at the battle of Kerangan Peris in the Batang Skrang region.