From Baima Pass to Jiazhou, a distance of nearly 500 miles, Li Shimin marched in the mountains for eight days and finally arrived at Longyou City on December 10th. However, before Li Shimin could breathe a sigh of relief, news came from the eastern front. Li Shimin was Rongzhou, regarded as the future new capital, was lost.
Since Li Yuan entered Shu, in order to strengthen the control of Bashu