They were his army
It was not the Terracotta Army that Qin Shihuang used to take the whole country, but the soldiers who the Terracotta Army modelled after. Thus the unification of China by Qin Shihuang was happened in 221 BCE.
Terracotta Army
The terracotta army is an example
terracotta army, bronze flask,.......
because it was to protect Qin Shi Huang's tomb
He ordered to build the Terracotta Army as his tomb guard in accordance with the appearance of his elite soldiers.
The Terracotta Army are statues and therefore were never real. However, the Images were based on a real army of soldiers commanded by Qin Shihuang. So the terracotta warriors never fought. They were made to accompany the emperor Qin Shihuang to the next life as the Chinese believed that they would be his army in that next life.
The Terracotta Army comes from Asia, specifically from the country of China. The army was created to accompany China's first emperor, Qin Shi Huang, in the afterlife.
The Terracotta Army here is referred to as the terracotta warriors and horses of Qin Shihuang. It was built in the Qin Dynasty prior to the Han Dynasty. Han Dynasty also had funeral figures with its own feature, besides military style, living style flourished at that time. Overall, Han's terracotta figures were various in style, but smaller in scale compared with Qin's.
the terracotta army was built to protect the tomb of Qin shihuang, the first emperor of china, to boast his power and show loyalty to him after his death.
There is no pyramid just Qin Shi Huangdi's tomb.
No, their "mission" was to protect the mausoleum of the emperor - Qin Shihuang.