Two of the most important historical texts on ninjutsu were the Bansenshukai and Shoninki. This is a translation and commentary on them.Included in the subjects are stealth, disguises, assassination, poisons, traps, tools, tactics and others.This translation into English is the first to be directly translated into English by a native speaker who can read old Japanese and who has a background and training in the subject matter.Also included in the work are chapters explaining the background of the subjects, such as religion and the status of the ninja as well as a translation of the 100 poems of Ise Saburo Yoshimori.This work should be on the shelf of every person interested in the art of the ninja as it was practiced in Japan.