Southern Song Enhanced Bed Crossbow

Timeline

1. 1221Lin'an (Southern Song traveling court) · ZhejiangThe Wujing Zongyao systematically recorded multiple bed crossbow types, including the three-bow bed crossbow, dou crossbow, and repeating crossbow mechanisms. The edition published around 1221 incorporated pulley-system power augmentation and improved sighting devices, providing a standardized technical text for frontier commanders' manufacture and deployment, marking the bed crossbow's rise from frontier experience to court military standard.
2. 1225–1228Shouzhou · AnhuiEmperor Xuan of Jin launched a major southern invasion in 1225; Song forces added large bed crossbows to key fortresses such as Shouzhou and Qizhou. Improved bed crossbows used stronger crossbow arms and iron trigger mechanisms, with a range exceeding 300 bu, specifically targeting Jin siege equipment and cavalry concentrations, forming tiered firepower with wall-mounted fire lances and thunderbolt guns.
3. 1220–1230Xiangyang · HubeiDefending commanders on the Xiangyang-Xiangfan line experimented with repeating crossbow mechanisms according to the Wujing Zongyao regulations; a single device could fire ten bolts in succession, used to suppress Jin crossbowmen and ladder infantry. Xiangyang, as the Northern Gateway of the Southern Song, saw its bed crossbow arsenal and craftsman maintenance system reach maturity in the 1220s, laying the foundation for city defense in the later Song-Mongol War.