出其不意，攻其不備

to catch an enemy off guard with a surprise attack (idiom, from Sunzi's "The Art of War" 孫子兵法|孙子兵法[Sun1 zi3 Bing1 fa3])

to go out / to come out / to occur / to produce / to go beyond / to rise / to put forth / to happen / (used after a verb to indicate an outward direction or a positive result) / classifier for dramas, plays, operas etc

variant of 出[chu1] (classifier for plays or chapters of classical novels)

his / her / its / their / that / such / it (refers to sth preceding it)

no; not so / (bound form) not; un-

to do sth when least expected (idiom); to catch sb off guard

unexpectedly / unawareness / unpreparedness

Italy / Italian / abbr. for 意大利[Yi4 da4 li4]

idea / meaning / thought / to think / wish / desire / intention / to expect / to anticipate

Italy; Italian (abbr. for 意大利[Yi4 da4 li4])

to attack / to accuse / to study

see 出其不意，攻其不備|出其不意，攻其不备[chu1 qi2 bu4 yi4 , gong1 qi2 bu4 bei4]

unprepared / off guard

to prepare / get ready / to provide or equip

(bound form) to prepare; to equip / (literary) fully; in every possible way