In order to obtain further support from the Turks, Liu Wuzhou presented the captured Fenyang palace maid to the Turks, and the Turkic Shibi Khan presented him with a war horse, which was regarded as a gift exchange, thereby enhancing friendship.

In order to support Liu Wuzhou and make it more convenient to use him in the future, the Turks canonized Liu Wuzhou as "Dingyang Khan" and sent him a wolf's head.

What kind of treasure is the wolf's head? It is a large flag marked with a wolf's head, and this symbol is a sacred symbol unique to the Turks - not forgetting the roots.

It can be seen how hot Liu Wuzhou and the Turks are, and the relationship is very close, temporarily intimate to the point that there is no gap.

Liu Wuzhou's achievements in expanding his territory were remarkable, his military might was greatly shaken, and with the Turks as his backer, he was not called emperor, which was simply intolerable. In the thirteenth year of the Great Cause (617), Liu Wuzhou proclaimed himself emperor in Fenyang Palace and changed his name to Tianxing.

Next, two groups of forces voluntarily surrendered to Liu Wuzhou, further strengthening his power.

When Liu Wu attacked Yanmen around him, it was guarded by Chen Xiaoyi, an official who was spotless in the officialdom of the Sui Dynasty. He led his troops to fight against Liu Wuzhou, and at the beginning, Liu Wuzhou did not take advantage of the slightest, sending troops once and losing once. Later, because Chen Xiaoyi was trapped in the lonely city, there were no reinforcements, and it was gradually difficult to support.

But Chen Xiaoyi is a kind of man, who swore to die in Yanmen to live and die together, and constantly sent people to contact Emperor Yang of Sui in Jiangdu, at this time the world was in chaos, and he couldn't send a letter, and it was obvious that the Sui family was dying. At this time, Chen Xiaoyi, who has always been clean and self-conscious, chose loyalty and toughness, fulfilled his duties, was besieged in the city for more than 100 days, there was no food, and it reached the point of cannibalism, and still did not surrender.

At the same time, Song Jingang, the leader of the Yizhou rebels, originally united with Wei Dao'er, the leader of the Hebei peasant rebel army, and wanted to beat Dou Jiande down, but was defeated by Dou Jiande. In order to survive, Song Jingang, after careful consideration, took 4,000 remnants and defected to Liu Wuzhou.

Liu Wuzhou heard that Song Jingang was good at using soldiers and was a rare talent, so he spent his blood to envelop him, first named him the king of Song, handed over military and political affairs to him, and did not hesitate to divide half of his family property. If he gives it again, his family will be gone. Song Jingang is a scumbag in marriage, and when he has a newcomer, he immediately quit his original partner and officially married Liu Wuzhou's sister.

Song Jingang saw that Liu Wuzhou was so dedicated to him, and others treated him as a man, and he would be a man, and he was willing to be driven by Liu Wuzhou.

The day Song Jingang became Liu Wuzhou's henchman was the beginning of Li Yuan's nightmare, and his old nest Jinyang was occupied by Liu Wuzhou with the assistance of Song Jingang.

Song Jingang joined Liu Wuzhou, and soon showed his strategic vision, and his vision was indeed higher than Liu Wuzhou. Regarding this, Liu Wuzhou humbly accepted it and was willing to use people's strengths to make up for his own shortcomings, which can be regarded as a good quality.

In March of the second year of Tang Wude (619), Song Jingang decisively put forward the great strategic policy of "entering Jinyang and fighting for the world in the south".

This means that it is a direct challenge to Li Yuan. Jinyang is the place where Li Yuan raised his troops, his beloved nest. At that time, he took all the elite troops to attack Chang'an, leaving only his fourth son, Li Yuanji, who was less than twenty years old, commanding a small number of troops and garrisoning Jinyang, like a window, with a layer of tissue paper, which could be blown by the wind at any time.