攻其不备 (攻其不備) gōng qí bù bèi

gōng qí bù bèi set phrase attack [the enemy] when he is not prepared
Domain: Idiom 成语 , Subdomain: , Concept:
Notes: (CC-CEDICT '攻其不備'; Guoyu '攻其不備')

Also contained in

出其不意,攻其不备