khan title, Yaoluoge Wuxi (藥羅葛烏希, with title of Wujie Khan) ambushed the Xiajiasi escort and took Princess Taihe. He had her write to Emperor Wuzong requesting that Emperor Wuzong create him the new khan and also lend the border city of Zhenwu (振武, in modern Hohhot, Inner Mongolia) to him to allow him to plan the rebuilding of Huigu. Emperor Wuzong responded with an edict that instructed Wujie Khan to remain outside Tang borders and requested Princess Taihe to personally return to Chang'an to report on Huigu's status. Wujie Khan did not follow Emperor Wuzong's orders, and Huigu remnants under him pillaged Tang's northern territory in earnest. He also made another request to borrow the border city of Tiande (天德, in modern Bayan Nur, Inner Mongolia), which Emperor Wuzong rejected. Emperor Wuzong further wrote a rebuking letter to Wujie Khan and warning of consequences, again ordering him to have Princess Taihe personally report and make requests. Emperor Wuzong also mobilized the forces of the circuits on the northern border, preparing a major retributive campaign against Wujie Khan. In winter 842, he also had the chancellor Li Deyu write a letter in his own name, addressed to Princess Taihe, sending it to the Huigu remnants along with winter clothes as a gift for Princess Taihe: In 843, Wujie Khan launched an attack on Zhenwu. Tang forces, commanded by the general Shi Xiong, prepared a surprise counter-attack. When he arrived near the Huigu camp, he noticed that there were some special wagons lined with rugs, and that the servants in those wagons were wearing red- and green-colored robes that appeared to be Chinese. He sent a scout to make contact and found out that these were Princess Taihe's train. He then had the scout again inform Princess Taihe of his plans to attack, and asked her and her servants to remain calm and not move during the attack. At night, he made a surprise attack on Wujie Khan's tent, and Wujie Khan's forces collapsed. Wujie Khan fled, and Shi then escorted Princess Taihe back to Tang territory. After return to Tang On April 4, 843, Princess Taihe arrived at Chang'an. Emperor Wuzong ordered the chancellors and the other officials to welcome and honor her. She took off her grand clothes and jewels, and she approached the palace, apologizing for the failure of her mission. Emperor Wuzong sent eunuchs to comfort her and