After the Anshi Rebellion, the Tang Emperor suffered from a disease called "civilian and military generals are not credible", in the emperor's view, in this year, if the hundred officials are reliable, the sows will probably go up the tree; if the fan town is reliable, the elephant may also dance, then only rely on the family slaves, the Tang Emperor ordered the eunuchs to directly participate in the command of the elite troops in the capital at that time, the Shen Ce army, this decision led to the eunuchs became a force to balance the fan town, which of the most powerful at that time, of course, the three towns in Hebei.
When we open the history of the second half of the Tang Dynasty, we naturally have a great sense of gap, and even a large number of negative information about the Tang Dynasty poured in. Even some people feel that the second half of the Tang Dynasty for more than one hundred and fifty years was a lingering struggle. However, this statement is unrealistic, but it is also excusable, because the psychological gap will lead to a lack of rationality, and a lot of emotional judgments are made. In the impression of some people, after the Anshi Rebellion, the Tang Dynasty became fragmented, and the three towns of Heshuo became an independent kingdom, which has a certain truth, but it is not completely true, because if the three towns of Heshuo are really so powerful, why not overthrow the Tang Dynasty at the first time? In the end, it was not the three towns of Heshuo who sent the Tang Dynasty to the grave, but Zhu Wen of Henan.
Some people may mention that if the "three towns of Hebei" are united, they can still organize a military force that can challenge the Tang Dynasty. Regardless of whether they can do better than An Lushan and Shi Siming. However, it turned out that the three towns in Hebei suffered from civil unrest soon after their formation. The three towns of Hebei "have never been monolithic: although the three towns in Hebei are the same as the Rebels of The An Shi, and the jurisdiction areas are also adjacent, they also have a certain basis for common interests. But after all, everyone does not belong to each other, and contradictions and conflicts will inevitably occur between each other. Shortly after the end of the Anshi Rebellion, Chengde Jiedu made Li Baochen and Wei Bojie make Tian Chengsi turn against each other, and Li Baochen even joined forces with another Anshi general, Ziqing Jiedu, to make Li Zhengji go to the table and request a crusade against Tian Chengsi. Subsequently, Zhu Tao, who had taken over Li Huaixian's Youzhou Jiedushi envoy, was also involved, and the three towns of Hebei and some other local separatist forces themselves fought each other.
After decades of repeated tug-of-war and conquest, the local "kings" and the central dynasty are no longer simply hostile or ruling jurisdiction, and the Song Dynasty man Yin Yuan once had a brilliant exposition on this: "Those who are weak in the Tang Dynasty, the princes are also; those who are weak and do not die for a long time, the princes are also Weizhi." Tang's weakness is also the strength of Hebei; the death of Tang is also the weakness of Hebei. ”