1. During Wu Tai's separation from Peking University in the Northern Wei Dynasty.

2. During Emperor Sui Gongdi's Yining period, Turks invaded the border.

About Mulan's name, mainly include:

1. Mulan, female name, surname unknown.

2. It is generally believed that the surname is Hua and the name is Mulan.

3. In addition, there are surnames Wei and Zhi Zhu, and some people say that "Mulan" is the surname, which is unknown.

Mulan disguised herself as a man and joined the army instead of her father. She fought on the battlefield for several years and made many meritorious deeds. No one found out that she was a woman. In the Tang Dynasty, he was named General Xiao Lie and was commemorated in a shrine. There are different opinions on the time of its emergence, but from the historical and geographical conditions, it can be judged that things and poems may have originated in the post-Wei period. This poem originated from the folk, and in the long-term spread process, it has traces of being polished by later literati, but it basically retains the characteristics that folk songs are easy to remember and recite.

Look up Mulan's poems and Yuefu's poems, both of which are included in Jiao's "Cross Blowing Songs". According to Guo Maoqian, the editor of Yuefu Poetry Collection in Song Dynasty, this poem was first recorded by Chen Zhijiang (Liang Wudi was then a Yueguan) in the Ancient and Modern Music Record. By the Tang Dynasty, it had been widely read, and Wei, a native of the Tang Dynasty, wrote Mulan Song, which can prove this point. Therefore, most scholars believe that Mulan poetry originated in the late Northern Dynasty.