Mirror of Tactical Courage
According to Peter Francis Kornicki FBA, a English Japanologist and Emeritus Professor of Japanese at Cambridge University and Deputy Warden of Robinson College, Cambridge, “This is a fine manuscript copy of Heihō Yūkan (‘Mirror of Tactical Courage’, perhaps) which was written in 1645 by Hōjō Ujinaga (1609-1670).
There is a copy in the Library of Congress. In addition, there are many extant copies in Japan, which suggests that it was popular and circulated widely. This copy consists of chapters 3-12 and 19-22, in two volumes; in all there are 52 volumes. The illustrations (especially those in the volume devoted to the construction of castles) and the calligraphy are of high quality and it looks like the paper is smooth high-quality torinokogami. So I would assign this to around 1700.”