Qiántún

Qiantun guarded the western end of the Liaoxi corridor, the narrow passage between the hills and the sea leading through Shanhai Pass. The Ming established Guangning Qiantun Guard in 1393 at the old city of Ruizhou. Together with Ningyuan Guard and a chain of smaller military posts, it formed part of the defenses controlling movement between Liaodong and the lands inside the pass. Its subordinate posts included Zhongqian, closer to Shanhai Pass, and Zhonghou farther east.