What is the position of "general returning to the soil" in the Western Han Dynasty, and why was he dismissed after finishing his work?

In the Western Han Dynasty, "General Fu Tu" was responsible for supervising the construction of the king's mausoleum and escorting the coffin to bury the king. In fact, it is the official position in charge of the emperor's funeral. Because it is responsible for the emperor's funeral, there are many things that must be considered. Fu Tu, a general of the Western Han Dynasty, once worked for Liu Heng, Emperor Xiaowen of the Han Dynasty. In order to establish its own Baling, Liu Heng convened more than 30,000 people. General Futu is responsible for building tombs for these 30,000 people. Once the late king was properly buried, General Futu's career was over.

The Western Han Dynasty specially set up an official post called General Fu Tu, which was established during the reign of Emperor Xiaowen of Han Dynasty and was responsible for Liu Heng's funeral. In ancient times, people, especially kings, attached great importance to what happened after death and thought that people died in another world. Liu Heng chose Baling in Bailuyuan, the eastern suburb of Xi, as his tomb, and appointed Zhang Wu, the general of Futu, to build the tomb, escort the coffin and bury the king after his death.

Futu general Zhang Wu is still very conscientious. He spent a lot of time on the construction and decoration of the mausoleum. Because Emperor Xiaowen of the Han Dynasty said that it should not be too expensive, he didn't use particularly expensive materials, but he still had to be decent. All the tombs and city gates were repaired with stones, and then put into funerary objects.

After Liu Heng's death, Futu general Zhang Wu escorted the coffin to the mausoleum. After the coffin was installed, some anti-theft mechanisms were set up and filled with soil. After everything is installed, the surface and surrounding environment of the tomb are the same as before the tomb was dug. Liu Heng, Emperor Xiaowen of the Han Dynasty, asked for simplicity. General Fujito did this very well, not only decently, but also without spending huge financial and human resources. But as soon as this task was completed, General Futu was removed from his post, because he was appointed for this purpose.