As above remarked, it seems most probable that the country into which the various Thangur chiefs moved, under pressure from the Chins, was almost entirely occupied by small communities having no power of cohesion. The greater part of these were absorbed, and now form the majority of the subjects of the Thangur chiefs; but some fled north and west into Manipur, Silchar, Sylhet and Tipperah, where they are known as Kukis and where their appearance caused much trouble, as, from the very nature of the cause of their migration, much ill-feeling existed between them and the triumphant Lushais. In Stewart's notes on Northern Cachar, it is stated that the Old Kukis made their appearance in Cachar about the end of the eighteenth century. These Old Kukis include the Biate (Beteh) and Hrangchul (Rhangkol) and other cognate clans who are now known to us as Khawtlang. They claim the hills round Champhai as their place of origin, and the sites are still known by their names. We have seen that the Lusheis claim to have sprung from a village south-east of Champhai, and that the Zadeng passed through Champhai on their westward move, which ended so disastrously for them. The advance of such tribes would be slow, and would be largely regulated by the rate at which they exhausted the cultivable land near their village sites; therefore the appearance of the Biate and Hrangchul in Cachar at the beginning of the nineteenth or end of the eighteenth century fits in well with the date I had assigned for Thang-ura, the first Lushei chief, before I had read Lieutenant Stewart's book. These Khawtlang clans to this day have little power of cohesion, and they naturally gave way at once before the well-organised Lushais, and fled north and north-west into Cachar and Manipur, passing through the territory of the Thado clans and suffering considerably at their hands. When the Thangur had firmly established themselves, and the capable Sailo chiefs had come to the front, they felt equal to fighting the Thado clans, which were as highly organised as themselves. The Sailo chiefs triumphed, and hence the eruption of the New Kukis, alias Thados, and cognate clans, into Silchar about 1848. In Colonel Lewin's "The Hill Tracts of Chittagong and the Dwellers Therein," page 109, is given an account of the "Cucis or inhabitants of the Tipperah mountains," written by J. Rennel, Chief Engineer of Bengal in 1800. With very slight alterations, this account is applicable to the Lushais of to-day, and I have no doubt that the Cucis therein described were the Rivung, the advance-guard of the great Lushai invasion.