is one of the alleged 18 fundamental skills of the Togakure-ryū school of ninjutsu

Ninjutsu

or may be:*the arts associated with espionage and assassination in feudal Japan, see Ninja*modern schools of martial arts claiming to be based in these traditions, see Modern Schools of Ninjutsu*fictional depictions, see Ninja in popular culture...

.

Alongside more orthodox and mainstream measures, Bōryaku includes use of unorthodox strategies

Military strategy

Military strategy is a set of ideas implemented by military organizations to pursue desired strategic goals. Derived from the Greek strategos, strategy when it appeared in use during the 18th century, was seen in its narrow sense as the "art of the general", 'the art of arrangement' of troops...

 and tactics, as well as manipulation of politics and exploitation of other current events to assist in subtle influence of the opponent.

Sources

• Dr. Hatsumi, M. (1981) Ninjutsu: History and Tradition. Burbank, CA: Unique Publications. ISBN 0-86568-027-2