The book of war. The author felt that in the late Ming Dynasty, there were continuous wars and the city defenses were derelict and weak, so he wrote this book in the 35th year of Wanli (1607), hoping that the soldiers could use it to defend the city and protect the people from military harm. The content is mainly focused on city defense, with more than 30 items including city defense matters, matters in case of change, and prevention matters. Including defensive tactics, management of residents' entry and exit inside and outside the city, food reserves, water source protection, selection of city defenders, emergency response, organization and training of regiments and township warriors, craftsmen and utensils necessary for city defense, etc.
