의병장이 · 의병장을
leader of a righteous army (volunteer militia)
Example
곽재우는 임진왜란 때 활약한 유명한 의병장이에요.
Gwak Jae-u is a famous righteous army leader who fought in the Imjin War.
Word parts
의 righteous+병 soldier+장 general
Literally 'general of the righteous soldiers'.