군대 [goon de] = army, military, troops

나폴레옹의 군대는 천하무적이라 여겨졌다.

na pol le ong eui goon de neun chun ha moo juk i ra yuh gyuh jut da.

= Napoleon's army was considered invincible.

https://www.learnwitholiver.com/korean/daily-sentence-2659