[Why] In mid-late Ming, severe sea-ban policy was implemented, causing overseas trade to be obstructed. Japanese Wokou pirates allied with lawless Jiangnan strongmen and ran mad burning, killing, and looting in the coastal regions of Zhejiang, Fujian, and Guangdong, with frontier defense in name only. [What] The renowned general Qi Jiguang broke convention to recruit Yiwu miners and farmers and built the strictly disciplined Qi Family Army. He invented the attack-defense-unified Mandarin-Duck Formation tactic, and at Taizhou and other places epically destroyed Wokou trouble. [Who] Qi Jiguang was an outstanding national hero of supreme military-innovation talent, combining military theory and engineering. The Qi Family Army officers and men coordinated through his Mandarin-Duck Formation were the absolute guardians of the coastal populace. [How] The victory of the anti-Wokou struggle successfully wholly cleared the Wokou trouble that had plagued the coast for decades, securing the prosperous stability of the empire's southeast coast. It became a landmark monument in the history of ancient China's coastal-defense tactics.
Why
The historic event of Qi Jiguang Defeating the Wokou represents a key developmental peak of the Huaxia dynastic system. The peak of tactical innovation securing imperial maritime coastal defense. By establishing this moral or administrative benchmark, it continues to shape the structural and philosophical fabric of ancient Chinese statecraft.