In the late Ming Dynasty, border troubles occurred all the time, the government was corrupt, and the Ming army's combat effectiveness was withered. Ordinary soldier Yang Zheng, with his insight into the Ming army's tactical loopholes and his ability to improve weapons, emerged in the bloody battle of Yanmen Pass and was initially promoted. He repeatedly defeated foreign enemies, but was hated by Zhang Jingzhi, the Minister of Household Affairs. He had his military pay deducted and was framed as a collaborator with the enemy. Thanks to Su Wanniang's care and the appreciation of the border generals, Yang Zheng resolved the crisis and was gradually promoted. He improved military discipline, improved firearms, and repeatedly performed extraordinary feats on the Jiliao defense line. Eventually, it developed into a trilateral system, stabilized the borders, and became an important force supporting the military in the late Ming Dynasty, supporting the Chinese barrier in troubled times.
