Therefore when want of good jhuming land and the aggressions of the eastern clans made it necessary for the Thang-ur to move, they naturally went westward. The Rokum, the eldest branch, are said to have passed through the hills now occupied by the Lushais, and some of their descendants are said to be found on the Tipperah-Sylhet border. The Zadeng followed the Rokum, and, passing through Champhai, moved westwards and about 1830 ruled some 1,000 houses divided into four villages situated near the banks of the Tlong or Dallesari river, round the Darlung peak. In alliance with Sailo chiefs of Lalul's family, they attacked and defeated successively the Hualgno (a Lushei family settled between Tyao and Manipur rivers) and the Pallian, who were their allies against the Hualgno. Subsequently the Zadeng quarrelled with Mangpura, then the most powerful Sailo chief, who, dying about that time, bequeathed the feud to his relatives, one of whom, Vutaia, prosecuted it with such vigour that the Zadeng, in spite of an alliance with the Manipur Rajah--who, however, proved but a broken reed--had to flee southwards, and their last independent village, numbering only 100 houses, broke up on the death of the chief, which occurred at Chengpui, near Lungleh, about 1857. The Zadeng chiefs are reputed to have been cruel and arbitrary rulers, whose defeat was not regretted even by their own followers. Their descendants have retained these qualities, and, in spite of much assistance, have failed to regain their position in the world. The Thangluah and Rivung took a more southerly course. The latter penetrated into what is now the Chittagong Hill tracts, and a chief named Vanhnuai-Thanga had a very large village on the Longteroi hill, between the Chengri and Kassalong rivers. He died about 1850, and shortly after his death the village was destroyed by Vutaia. The remnant of the Rivungs fled to Hill Tipperah, where Liantlura, a great-grandson of Vanhnuai-Thanga, had a village up till a few years ago, and there is one small hamlet under a Rivung chief in the Aijal sub-division of the Lushai Hills. The Thangluah penetrated as far as Demagri and Barkhul, where Rothangpuia (Ruttonpoia) became known to us, first as a foe, and then as a faithful ally. Rothangpuia's son Lalchheva, fretting at our control, moved his village across our boundary, in spite of a warning that Government could on no account protect him if he did so. Very shortly after this move he was attacked by Hausata, a Chin chief, and his village totally destroyed, many persons being killed and more taken captive. All the mithan (tame bison) were driven off and the chief escaped with little more than the one cloth he was wearing, and now the once prosperous Thangluah clan is represented by only a few poverty-stricken hamlets round Demagri.