Because the Tang Dynasty army blocked the canal with boulders, and sent the general Cheng Mingzhen to destroy the Xia army's grain route along the road, Dou Jiande has been in a state of shortage of grain and grass.

finally survived to spring, and Dou Jiande decided to go west and knock on the pass.

In the early spring of March, the Yellow River thawed, and Dou Jiande led his army to continue westward.

When the army marched to the border of Xingyang, the scouts came to report that Li Shimin led the Xuanjia army to arrive at Wugao Pass.

Dou Jiande decided that the army would build a camp on the field of Chenggao.

He knew that there would be a fierce battle under the Martial Prison Pass, so he needed to be fully prepared here.

The Tang army backed the Xiongguan Pass and intercepted the Xia army under the Wugao Pass.

With all the main forces of the Tang Army coming to the west of Wujiao Pass, Li Shimin decided to challenge the Xia army.

In the coming day, Li Shimin personally led 500 cavalry to reconnoiter Dou Jiande's military camp.

He accompanied him with four generals, Wei Chi Jingde, Li Shixian, Cheng Zhijie, and Qin Shubao. These four generals are not descendants of the King of Qin, and they all came to the Tang Dynasty from the enemy camp later.

Li Shimin knew that Wei Chi Jingde was good at using horse lance, so he arranged for Wei Chi Jingde to go to Dou Jiande's camp with him to explore the camp, and the rest of the generals led their troops to ambush on the main road.

Li Shimin said to Wei Chi Jingde: "I hold a boxwood bow, and you carry a wolf's tooth lance with you, even if there are millions of troops, what can I do?" ”

He also commanded: "When the enemy sees us, let us go back immediately, and this is the best policy." ”

Wei Chi Jingde understood that this was a trick to lure the enemy, and readily agreed.

When they walked to the place where there were still three miles left from Dou Jiande's camp, they were discovered by the guerrillas in Dou Jiande's camp, and when the other party thought they were scouts, Li Shimin shouted: "I am the King of Qin!" As soon as the voice fell, the boxwood bow shot an arrow, and the enemy general was killed!

Dou Jiande's camp was greatly alarmed, so he sent five or six thousand cavalry to chase after him, and the Tang army that accompanied him saw that the enemy was outnumbered, and his face turned pale with fright.

Li Shimin said unhurriedly: "Everyone just go forward, I and General Wei Chi are behind." ”

Most of the enemy soldiers who pursued closely were killed by Li Shimin with an arrow, and he would be killed with every arrow, and the arrow was not missing. The rest who followed closely were all killed by Wei Chi Jingde with wolf fangs.

Therefore, the enemy did not dare to chase too closely, but only slowly pursued from an arrow away......

When the enemy army came to the ambush area of the Tang army, Li Shiyun and others suddenly killed, defeated the enemy army, and beheaded more than 300 people. He also captured the enemy generals Yin Qiu, Shi Zan and others.

Li Shimin tried his hand and won the first battle.

So he wrote a letter to Dou Jiande, persuading him to stop the march and return to Hebei, so as not to lose the princes and marquises, and be rich forever, why bother to come here to accompany Wang Shichong's funeral.

When Dou Jiande saw the letter, he was resentful in his heart, he believed that he was also a general of a hundred battles, and he didn't want the army to come here for the first time, but he was defeated. I thought to myself, no matter what, I want to win here...... Only in this way can we get rid of this evil breath in our hearts.