This chapter details Mohist counter-tunnel tactics. It uses leather-covered jars to detect digging sounds, dig intercepting tunnels, and deploy mugwort smoke, spears and vinegar to defeat underground enemy assaults.
This chapter records Mozi’s talk with disciple Qin Guli on city defense. It lists twelve siege tactics and matching countermeasures, detailing fortifications, weapons, manpower allocation and fourteen essential defense prerequisites.