出其不意，攻其不备
chū​qí​bù​yì​gōng​qí​bù​bèi

to catch an enemy off guard

  1. 出其不意 chū​qí​bù​yì
    to take someone by surprise
    to act when the other party is least expecting it (idiom); to catch someone off guard
  2. ， gōng
    non-Chinese
  3. 攻其不备 攻其不備 gōng​qí​bù​bèi
    to catch someone off guard
    to launch a surprise attack when the opponent is unprepared; to catch an enemy unawares