Ming Great Wall Border Defense System

Timeline

1. 1368–1424Various sections of the northern frontier · North ChinaAfter driving out the Yuan dynasty, the Hongwu Emperor ordered Xu Da and other generals to oversee wall-building along the northern frontier, repairing old walls and building new sections mainly of rammed earth. During the Hongwu era, key passes such as Juyong Pass and Shanhai Pass were renovated and the Nine Frontier Garrisons garrison system established. The Yongle Emperor launched five northern campaigns against the Mongols, attacking in place of defending, while still maintaining passes and beacon towers, laying the foundation for later large-scale brick-and-stone construction.
2. 1569–1583Jizhou Garrison Great Wall · JizhouAs commander-in-chief of Jizhou, Qi Jiguang oversaw major repairs of the Jizhen section of the Great Wall (about 1,200 km) and created the 'hollow watchtower' design—multi-story hollow towers built inside the wall for garrisoning troops, storing grain and supplies, and mounting cannons and firing ports. He also integrated infantry, cavalry and firearms units, transposing the Qi family army's tactics onto the Great Wall defense system, forming a layered in-depth defense posture with the support of Grand Secretary Zhang Juzheng.
3. 1601–1610Liaodong–Jizhen border line · JizhouAround the 30th year of Wanli (1602), Nurhaci completed the unification of Jianzhou Jurchens and the Liaodong border grew tense. The Jizhen section maintained the higher defense standard set by Qi Jiguang's repairs, but the Liaodong section (around present-day Liaoning) suffered increasingly from insufficient troops and military neglect. The court created the post of Liaodong Superintendent and strengthened military deployments around Liaoyang and Shenyang, shifting the defense focus eastward—marking the Great Wall system's strategic transition from solely resisting the Mongols to confronting the new Jurchen threat in the northeast.