In 1907, Yun created and led the first all-woman righteous army, training her militia in fighting techniques herself.

[2] In 1895, the Japanese assassination of Korean Empress Myeongseong ignited public unrest across Korea, and Yun's father-in-law prepared his militia for war.

/ Let us march out to join the righteous army, / Let us help our militia troops, / If they are seized by beasts, / Would the Japanese ever save them?

[3] Yun raised funds to support Korean troops and organized the installation of a weapons factory in Jusan, Yeouinaegol.

Before Yun and her son could follow, they were arrested and threatened by Japanese police, who demanded to know the whereabouts of Yu Hong-seok.

Yun refused to reveal any information, and the Japanese finally left them alone, impressed by her fortitude.

Yun continued to train her militia women and led them in attacks on Japanese camps.

Freeing Korean prisoners from Japanese camps, Yun hid them in secret caves and helped them survive.