Dou Jiande Chen Bing Huazhou, personally wrote a letter to Li Yuan, and sent a secret envoy to Chang'an.

The letter: "Tang Gong, Tang Xia has formed an alliance for some time. At present, Tang Gong is anxious to destroy Zheng and dominate the rivers and mountains. Xia thought about it for himself, hoping that Tang Gong could relieve the siege of Luoyang. Otherwise, my army of 300,000 will arrive at Luoyang City in a few days......"

When Li Yuan saw the letter, he couldn't help frowning, and he immediately convened his ministers to discuss the matter.

At this time, the left servant shot Pei Lin and went to prison, and the military department Shangshu Qu Tutong was on the front line in Luoyang, and Li Yuan was left with the crown prince Li Jiancheng, the right servant Xiao Yu, Chen Guogong, Chen Shuda, and Zhongshu Ling Feng Deyi and others.

Xiao Yu has always been upright, he suggested continuing to increase the troops in Luoyang, unifying the mountains and rivers, in one fell swoop!

The crown prince Li Jiancheng presided over the defense of the northwest, and he did not agree with what Xiao Yu said, and said: "Your Majesty! Shortly after the death of the Khan of Chuluo, the successor of the Khan was a ruthless character. It is reported that he sent assassins several times to assassinate Tongye Hu Khan, but he did not succeed, and it seems that he wants to concentrate his forces on the front line of our Datang. ”

Li Yuan nodded and said, "I know Jieli, this person is very cunning. He had to be guarded against. The troops defending the west cannot be withdrawn. At present, all the elite soldiers and strong generals of the Tang Dynasty have been given to Erlang, and it depends on whether he can withstand it. ”

Chen Guogong Chen Shuda spoke: "Your Majesty, according to Weichen, Dou Jiande is bluffing. Not to mention that Luo Yi is contained in the rear, I doubt that Hebei's soldiers can bring out 200,000. Secondly, Xu Yuanlang and Meng Haigong are newly attached, and the hearts of the people are not aligned, what can Dou Jiande give them? Weichen believes that for the sake of the Tang Dynasty, these two people can be co-opted. ”

Li Yuan responded: "Meng Haigong is Wang Shichong's sworn friend, but Xu Yuanlang can be used by me." ”

Feng Deyi handled things tactfully, and he spoke: "Your Majesty Shengming, then send a secret envoy to go, what Dou Jiande gives him, we will double it." In addition, Your Majesty, Weichen is foolish, and Weichen will go to Luoyang in person to observe the military situation before making a decision! ”

Li Yuan immediately said: "This plan is very appropriate! ”

……

In view of the large strength of the Xia army and the fact that the Tang army had been on the expedition for half a year, Li Yuan was a little relieved.

He personally ordered Feng Deyi to be the pacification envoy of Guanrong, and brought a large amount of military money and food to the camp in Bishan.

Before leaving, Li Yuan repeatedly instructed: "Erlang is full of spirit and vows to win, Aiqing goes to the camp to look at it, if you don't have the certainty of victory, you can report it quickly." Don't let Jiro take risks! ”

Seven days later, Feng Deyi came to the camp in Pishan. Because of the distribution of food and wages, the Tang military camp was cheering and morale was high.

The generals asked for battle one after another, wanting to conquer Luoyang City in one fell swoop.

As the commander-in-chief, Li Shimin stopped the soldiers' requests in time.

He said to everyone: "Luoyang is at our fingertips for our army. But we can't conquer it, keep it, it's a delicious bait, to catch the big fish of Dou Jiande. If you roar down like this, the big fish will run away! ”

The soldiers suddenly realized, looked at each other, and couldn't help laughing.

Then they all bowed their hands and said: "Listen to Your Highness's arrangement!" ”

Seeing this, Feng Deyi learned that Wang Shichong had basically run out of energy, and knew that Li Shimin was actually the only real enemy left at this time, Dou Jiande.

So he wrote to Li Yuan, telling the truth, and said that the king of Qin was just waiting for the opportunity to fight Dou Jiande at this time......

When Li Yuan learned the truth, he had a bottom in his heart, so he wrote back to Dou Jiande: "King Xia, if you break the covenant first, my Datang will have to accompany you to the end!" ”

Dou Jiande was convinced, so he no longer had any hope for Li Yuan. He sent an envoy to the Turks to meet together to deal with the Tang Dynasty.