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Due to Li Siye's unfortunate death, General Tiance of the Tang Dynasty and the Grand Marshal of the Army, Li Qing'an, finally decided to personally expedition the Uighurs. On March 20, the third year of Qingping, Li Qing'an held a grand northern expedition ceremony under the Zhuque Gate of Chang'an. During the farewell of nearly one million Chang'an people, Li Qing'an wore a golden helmet and iron armor, a sword and a long spear, rode on Gao Jun's Arab white horse, and led 100,000 Tang army cavalry to walk through Zhuque Street, walked out of Chang'an City, and headed towards Taiyuan.

At the same time, Li Guangbi from the Eastern Front also gathered 150,000 troops in Youzhou, waiting for Li Qing'an's northern expedition. Li Sheng from Taiyuan has also gathered 50,000 elite troops in Taiyuan, ready to go.

In Lingzhou, Duan Xiushi, the new Shuofang Jieduan, also deployed 100,000 Shuofang troops on the front lines of Lingzhou and Hetao to defend the Uighur army from entering the inner road of the pass.

In order to win this Northern Expedition that completely eradicates the troubles of the north, the Tang Dynasty mobilized almost the whole country. People from all over the Tang Dynasty enthusiastically donated grain and money. In just half a month, the donations of money in various places had reached 1.7 million jin and 2.2 million shi of grain, which fully met the logistics needs of the Tang army.

On March 26, Li Qing'an led an army of 100,000 to Taiyuan. In Taiyuan Prefecture, he formally issued an order to expedition the northern expedition. Li Guangbi led 150,000 cavalry out of Juyongguan and marched towards Yinshan. Li Qing'an arrived in Yunzhou on the fifth day of the April 2018. He also led 150,000 cavalry out of Qingsai Fort out of the Great Wall and marched towards Yinshan.

At this time, Li Qing'an had already obtained information, and the Uighur Gele Khan also led more than 100,000 troops to the direction of Yinshan. As Li Qing'an judged, the first goal of the Uighurs was not to attack the Tang Dynasty, but to accommodate the 100,000 remaining troops of Shi Siming and his son and the 50,000 troops of the Pugu tribe.
Chapter completed!