The Paragon of Military Strategy Volumes 17-20 of 52.Written by Hojo Ujinaga of the Koshu School of Military Theory.This Military Strategy treatise was presented to the third Tokugawa Shogun Tokugawa Iemitsu. Hojo Ujinaga studied the Koshu School of Military Science under Obata Kakgenori and became his successor.Introduced elements of Chinese Military Strategy such as Sun Tsu into it and began the Hojo School of Military Science.A supporter of the Edo Bakufu government he eventually became a retainer.