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.
This chapter recounts Mozi’s famous mission to stop Chu from attacking Song. He travels ten days to defeat master craftsman Gongshu Ban’s siege engines in a simulated battle, then reveals 300 disciples already guard Song, forcing Chu to abandon the war.