Song Dynasty City Defense System

Timeline

1. 1041–1044Frontier forts such as Yanzhou and Huanzhou · ShaanxiAfter the outbreak of the Song-Xia War, the court allocated cash and laborers to build the walls of frontier cities such as Yanzhou and Huanzhou, deepening moats and constructing barbicans and horse-face bastions; forts gradually shifted from earth-and-timber construction to brick-and-stone facing, forming strongholds capable of withstanding Tangut cavalry charges.
2. c. 1042–1048Key fortresses in Longyou such as Qinzhou and Weizhou · TianshuiFrontier forts commonly built crossbow towers, enemy platforms, and watchtowers atop their walls, deploying bed crossbows, rolling stones, and crushing logs; defending forces deployed by sector according to the regulations recorded in the Wujing Zongyao, forming a layered firepower system of long-range bow-and-crossbow fire and close-range mechanical defense.
3. 1044–1050Northwestern frontier cities · ChinaAfter the completion of the Wujing Zongyao, incendiary firearms such as fire arrows, fire balls, and poison smoke balls were incorporated into the city defense equipment lists; defenders used firearms from the walls to burn siege ladders and siege towers, extending the city defense system from traditional cold-weapon defense to a comprehensive form combining cold and hot weapons.