What is an ancient poem when a woman disguised as a man goes to war and bows and arrows with her strength?

Mulan poetry.

Mulan Poetry is a long narrative poem in the folk songs of the Northern Dynasties. It tells the story that Mulan disguised herself as a man, joined the army for her father, drew a bow and shot arrows on the battlefield, made meritorious deeds, refused to be an official after returning to the DPRK, and just wanted to go home and reunite. Enthusiastically praised the women's brave and kind quality, the enthusiasm for defending the country and the fearless spirit.