Hua Mulan is a legendary female warrior described in Mulan Ci in the Northern Dynasties. She joined the army instead of her father. The mainstream of academic circles thinks that she is a Xianbei person. The original "Mulan Ci" did not express Mulan's surname, age, native place and other information, nor did it record her deeds in official history. Instead, it gradually developed into a well-known indicator of ancient women's joining the army from poems, folk operas and local county records.
Mulan joined the army instead of her father;
During the Northern Wei Dynasty, nomadic people in the north constantly harassed the border. The Northern Wei regime wanted men to go to the border to fight, but Mulan's father was old and her brother was young, so Mulan decided to join the army instead of her father until she returned home in triumph decades later. Because of her great contribution, the emperor pardoned her for cheating the monarch, and at the same time believed that she was capable of serving in the court and holding an official position. But Mulan refused, because she had an old father to take care of, and asked the emperor to let her go back to China to make compensation and honor her parents.
Reference to the above content: Baidu Encyclopedia-Mulan