"Lower fighting" means tomb robbery, which means that when you go down to the tomb, you will always encounter incredible things, and you will have to go through a struggle to save your life. There have always been many tomb robbers, and the reason why so many people have taken the risk of going down to the tomb is because in ancient times people paid attention to thick burial, and since it is a thick burial, there is no treasure in the tomb.

In September 1960, a princess tomb was discovered by the archaeological team, this tomb in present-day Qianxian County, Shaanxi, archaeologists excavated and learned that this is the joint burial tomb of Princess Yongtai Li Xianhui and her husband Wu Yanji, the seventh daughter of Emperor Zhongzong Li Xian, the mother is Empress Wei, Li Xianhui was only 17 years old when she died, and the archaeological team entered her tomb, only to see a man, guarding the rare treasures for a thousand years.
At that time, archaeologists were also quite curious, and thought that li xianhui's suitor followed, the epitaph recorded that Li Xianhui's appearance was "inferior to the peach and plum flowers", Tang Zhongzong also loved this daughter very much, Li Xianhui's tomb is also the only tomb in China's history called "ling" princess, its specifications are the same as the emperor.
However, the archaeologists then found that the sitting man was injured, and the archaeologists understood that the man was actually a tomb robber, and it was estimated that he and his accomplices were "seeing the money and opening their eyes", and finally he was knocked down by the accomplices, the accomplices saw the crime, and took some funerary goods in the tomb and fled in a hurry.
After identification, this sitting man belongs to about five generations or the beginning of the Song Dynasty, more than 20 years old, but he has been "sitting" in the tomb for thousands of years, and there are black handprints on the wall, which is really regrettable.
However, there are also many opinions about the cause of death of Yongtai Princess Li Xianhui, according to the official history, in the first year of Jiushi (700), Li Xianhui, who was initially crowned as the lord of Yongtai County, married Wu Yanji, the eldest son of Wu Chengsi the Prince of Wei, in the first year of Dazu (701), Li Xianhui's brother Li Chongrun and Wu Yanji privately discussed Wu Zetian's "male favorite" Zhang brothers, and Li Xianhui was also involved.
When Wu Zetian learned of this, he executed Li Xianhui, Li Chongrun, and Wu Yanji, and the Zizhi Tongjian records that "Empress Dowager Chunqiu was high, and Zhang Yi's brother in political affairs was discussed secretly by his sister Wu Yanji, the lord of Yongtai County, and his son-in-law Wu Yanji the Prince of Wei. Yi Zhi sued the Empress Dowager, September, Nongshen, and the Empress Dowager all forced them to commit suicide. ”
For more than a thousand years, historians have believed that Li Xianhui was killed by Wu Zetian, but in 1982, the tombstone of the "Tombstone of Princess Yongtai of the Tang Dynasty" was unearthed in the tomb of Princess Yongtai, which read: "The pearl fetus destroyed the moon", that is to say, Li Xianhui died due to difficult childbirth, because her brother and husband were given death by Wu Zetian because of the discussion of the Zhang brothers, Li Xianhui was pregnant at this time, and was not immediately disposed of, but because of the panic and fear in her heart, she eventually died in childbirth.