instruction in martial arts; teaching of military strategy
Refers to the act of teaching or the content of instruction in traditional martial arts and military tactics. Often used in historical or classical contexts.
He gave instruction in martial arts to the young samurai.
兵法 refers to martial arts or military strategy itself, while 兵法指南 specifically means the instruction or teaching of it.
指南 means guidance or instruction in general; 兵法指南 narrows it to martial arts instruction.
Compound of 兵法 (martial arts, military strategy) and 指南 (instruction, guidance). The exact historical derivation is uncertain, but the term is conventionally associated with teaching traditional Japanese martial arts.