This was especially so at times of rebellion when Kuan Kung could be called outto show up the disloyalty of the rebels and spur on the morale of the government troops.
尤其遇到民間有叛亂時，請出關公，一來凸顯叛民的「不忠不義」，二來藉戰神的威儀激勵官兵士氣。