In 1199 the two friends made a joint expedition against the Naimans. This tribe was now divided between two brothers who had quarrelled about their father's concubine. One of them, named Buyuruk, had retired with a body of the people to the Kiziltash mountains. The other, called Baibuka--but generally referred to by his Chinese title of Taiwang, or Tayang--remained in his own proper country. It was the latter who was now attacked by the two allies, and forced to escape to the country of Kem Kemdjut--_i.e._, toward the sources of the Yenissei. Chamuka, the chief of the Jadjerats, well named Satchan, or "the Crafty," still retained his hatred for Temudjin. He now whispered in the ear of Wang Khan that his ally was only a fair-weather friend. Like the wild goose, he flew away in winter, while he himself, like the snowbird, was constant under all circumstances. These and other suggestions aroused the jealousy of Wang Khan, who suddenly withdrew his forces, and left Temudjin in the enemy's country. The latter was thereupon forced to retire also. He went to the river Sali or Sari. Gugsu Seirak, the Naiman general, went in pursuit, defeated Wang Khan in his own territory, and captured much booty. Wang Khan was hard pressed, and was perhaps only saved by the timely succor sent by Temudjin, which drove away the Naimans. Once more did the latter abandon the captured booty to his treacherous ally. After the victory, he held a Kuriltai, on the plains of Sari or Sali, to which Wang Khan was invited, and at which it was resolved to renew the war against the Taidshuts in the following year. The latter were in alliance with the Merkits, whose chief, Tukta, had sent a contingent, commanded by his brothers, to their help. The two friends attacked them on the banks of the river Onon. Raschid says in the country of Onon, _i.e._, the great desert of Mongolia. The confederates were beaten. Terkutai Kiriltuk and Kuduhar, the two leaders of the Taidshuts, were pursued and overtaken at Lengut Nuramen, where they were both killed. Another of their leaders, with the two chiefs of the Merkits, fled to Burghudshin, _i.e._, Burgusin on Lake Baikal, while the fourth found refuge with the Naimans.