[2] Rentap was mentored by Dana Bayang and accompanied him on major ngayau (headhunting) expeditions from south of Sarawak to the Kapuas River in what is now West Kalimantan, Indonesia.

When Dana Bayang grew old, Libau Rentap took over as the commanding officer and led several similar sea war expeditions to raid Sambas and Pontianak, Indonesia.

Rentap took the nephew's keris (dagger) which was distinguishable by its golden handle and gained fame from the incident, recognized by the Iban-Dayak Skrangs as their great war chief.

In August 1839, Brooke arrived in Kuching, Sarawak and gave his assistance in crushing a Malay rebellion against the Sultan of Brunei.

[3] Brooke reinstalled the Malay chiefs into their former positions to help him administer their people in the state, and was highly successful in suppressing the widespread piracy of the region.

OKP Dana Bayang's longhouse at Nanga Padeh was the strongest and most important, defended by two forts and a barrier of fallen trees that blocked the Batang Saribas River from being easily entered by their enemies.

Brooke's forces proceeded up the Saribas to Karangan Pinggai and on 14 June attacked the fort of Linggir Mali Lebu, a chief mentored by Dana Bayang.

The battle at upper Undop resulted in the First Lieutenant Charles Wade being killed in action and deposed Sherif Jaffer of Lingga, bringing relative peace to the coast.

He ambushed the advance trackers of Brooke's reconnoitring troop with a formidable array of war boats and thousands of men on either bank of the river, placed to effectively use spears and blowpipes.

With boats and bamboo rafts blocking their retreat, the troop's white leader Mr Stewart, a Malay chief Datuk Patinggi Ali and 30 of his men were killed, and 56 others were wounded.

Meanwhile, the Skrang boats tried to escape by paddling to the Batang Lupar river mouth where they were unsuccessfully ambushed by Brooke's schooner, the Nemesis, which was lying in wait for their return.

The establishment of Fort James at Skrang prevented Rentap's warriors from joining those under Linggir and Aji (Dana Bayang's son) and blocked their passage to the South China Sea where they might raid the people living along the coast.

While primarily a defensive measure to keep the peace, this was effectively an embargo against those who had not submitted to Rajah Brooke's rule, preventing them from collecting sea salt and other essentials.

Heavy fire from the stockade then forced Rentap's warriors to retreat upriver, where they came under attack from a rival chief who had sided with the White Rajah.

While Rentap was strongly opposed to the presence of white men, Jelani was the figurehead of a party that did not support either side of the conflict but watched to see which would win.

[2] In August 1854, Rajah James Brooke proceeded up the Skrang River with a large group of warriors, about 7,000 from the Dayak and the Malay community from Kuching.

Due to poor health, Brooke stayed with a strong force to protect their war boats and baggage at Enteban, the navigable extent of the Skrang.

During this period, Charles Brooke continued the work of persuading chiefs to submit to the White Rajah's rule, rewarding them with open trade and the construction of forts to defend their people while preventing Rentap's followers and allies river access to the South China Sea.

Aji was likewise busy visiting warriors and war leaders, inciting them to support a fight against the Sarawak government which continued to extend its power.

Charles Brooke organised a war expedition consisting of 3,500 Dayaks and 500 Malays to crush Rentap at his stronghold on Sadok Hill.

Rentap's fort was formidable as it was surrounded by a cliff, and the walls were made of vertical ironwood (Tebelian) planks that could not be penetrated by rifle shots.

[5] At 4 p.m., the attacking party reached within a few yards of the fort, whose defenders started throwing spears and stones in addition to using their muskets and small swivel cannons.

Rentap victory Aji, the third son of Dana Bayang, continued to fight those who had submitted to Brooke's rule in the lower Layar river, travelling by land to bypass the fort at Betong.

The next day, the force divided into two columns: one sent to the adjacent Julau area to punish Mujah Buah Raya (Rentap's ally); the other, led by Brooke, would attack Sadok Hill.

Some of Brooke's war chiefs begged him to stop attacking, saying "We cannot pull up the planks with our own hands, we cannot climb over them and our small gun and musket shots make no effect on them."

On 20 October, Brooke sent two messengers to summon Nanang and Luyoh to a meeting, at which they submitted to the White Rajah, providing 40 valuable ceramic jars named Tajau Rusa to the government of Sarawak to ensure their loyalty.

They found the arms captured by Rentap when he fought against Lee and Brereton at Lintang Batang in 1853, a large quantity of gunpowder, and the One-armed Bachelor.

He was not buried, but his remains were kept according to the symbol of the Iban-Dayak warrior which was honourably laid down to rest in peace in a mortuary known by the Iban Dayak as Lumbong.

He was met with several victories and defeats but never once surrendered, even at expense of losing his homeland in Skrang after being forced to migrate to the further away northeastern region at Lanjak-Entimau Hill.

When he retired from active fighting, he swore that he would never see the face of a white man again in his life, and managed to live until he met his natural death.