Türk

"The two emperors carried the warfare out into the Türk heartland with overwhelming success. A combination of intrigue and attack destroyed Hsieh-li in 630. First, the Chinese persuaded the enemies of the Türk, a confederation of peoples called the Tölös to attack Hsieh-li from the rear. Then a Türk pretender, T’u-li Qaghan was supported by the T’ang as the qaghan of the Türks. The T’ang themselves then encircled Hsieh-li in 630 north of Shansi. The result of this direct offensive destroyed Eastern Türk power for fifty years. Not until 683 was a Türk Qaghan once again able to rally his people against the Chinese. / With the Eastern Türk destroyed, the T’ang turned its offense against the Western Türk still powerful, in Dzungaria."