A series of expeditions was planned by his Highness that for this reason met with but partial success. It is unnecessary to record the details of each, for each repeated the experience of the former with painful iteration, and we have already given an account of some of the earliest of these punitive expeditions. But it will be necessary to record them, to show how great were the difficulties the Government had to contend with before the turbulent tribes of the interior could be brought to submission. A great many of the Ulu Ai Dayaks had settled in the Katibas river, which is the highway from the Rejang to the Kapuas river in Dutch territory, and these Dayaks were incessantly giving trouble by making predatory raids against their enemies over the border. The Dutch had complained of this, and the Rajah had attacked them in 1870, as we have recorded, but as they continued to give trouble, he again attacked them, for the third time, in July 1871, taking them on this occasion completely by surprise; and driving their chief, Unjup, over the frontier, where he might have been captured. Unjup was the brother of the powerful chief Balang, who had been previously executed for plotting against the Government.[328] Later on he was allowed to return, and was pardoned on making humble submission. He subsequently became a Government chief or pengulu, but he was a useless character. After the third attack, this tribe was moved to the lower waters of the Katibas, and an interval of uninhabited jungle was put between them and their enemies. However, what is born in the bone must come out in the flesh, and, in 1874, they again broke away and attacked, on this occasion the Tamans and Bunut Malays of the Kapuas. It was, however, a case of _lex talionis_; and these people had brought it upon themselves by their own treacherous conduct in inveigling six Dayaks, who were on a peaceful visit to their country, into a Taman house, where they were seized and bound. Thence these six had been sent to Bunut, a large Malay settlement, and were there put to death in a most cold-blooded manner. Nevertheless the Dayaks had to be taught not to take the law into their own hands. But properly the Netherlands officials were the most blameworthy for not having promptly secured and punished the Malay murderers and their accomplices.