In the Shandong province of Ming dynasty China, Zhu Di, Prince of Yan, defeats the Imperial forces of General Li Jinglong in the two-day Battle of Baigou River, by taking advantage of the chaos that results when a gust of wind breaks the staff of General Li's flag of battle. The Yan forces capture 100,000 of the Imperial soldiers as prisoners and Li and the others retreat to Jinan (apr 23, 1400 – apr 25, 1400)