When the Donghak Peasant Revolution started, Yun was deployed in Jeolla Province.

[3] Yun was assessed as a good keeper who helped people by preventing crimes.

[7] As Yangho Jippogwan, Yun was ordered to arrest the bandits in Jeolla Province.

[8] On 13 April 1905, Yun was promoted to Major[9] and as Lieutenant Colonel in November.

[12] By the request of Minister of Military, Yi Geun-taek, Yun was awarded for his merits again in 1906.