The period of Xuanzong in Tang Dynasty was called "the prosperous time of Kaiyuan", but this heyday was changed by a turning point, which was called "An Shi Rebellion" in history. The Tang Dynasty ushered in this rebellion under the peaceful and prosperous times. At that time, the scope of rebellion was too wide and the people were displaced. Even if someone deliberately recorded it, it would be difficult to survive. There is no stable situation for people to record if they want to continue copying.

However, thanks to the works of a great poet, we can understand this unprecedented war. Du Fu recorded the process of the riot in his poems.

Du Fu lived in a time when the Tang Dynasty turned from prosperity to decline. The "An Shi Rebellion" in 755 BC was the key to the drastic changes in this era. Du Fu experienced "the flourishing age of Kaiyuan" and "Anshi Rebellion". It can be said that he is a witness of this period. At that time, Du Fu was trapped in the rebels, saw the cruelty of Hu Bing with his own eyes, and felt the coldness of the world on the way to escape. He cried with his fellow villagers and mothers who saw him off. This is why Du Fu is a poet who cares about the country and the people.

To Du Fu's heartache and helplessness, in order to quickly replenish soldiers, the Tang Dynasty implemented an unrestricted and even inhuman conscription policy. The spear in the soldier's hand is even higher than himself. This kind of fighting capacity is tantamount to dying in the battlefield! However, this extreme policy is not recorded in history books, but is recorded by Du Fu in his masterpieces "Three Officials" and "Three Farewells". This terrible conscription policy is the most painful for those who suffer. In fact, the whole story of this war is not to solve the civil strife in the Tang Dynasty. In practical sense, this is tantamount to saving the nation from extinction.