洪承疇
Hong Chengchou started his career under the Ming Empire by leading military campaigns against rebels in the 1620s. Like Yuan Chonghuan, Xu Guangqi, Sun Yuanhua and other Ming generals, he was also a leading military strategist and proponent of the adoption of European cannons by the Ming armies. He served as the Governor of Shaanxi and Sanbian and was responsible for countering rebel forces led by Li Zicheng. He defeated Li Zicheng at the Battle of Tongguan Nanyuan in 1638, after which Li fled with only 18 men. After that battle, he was transferred to the northern border to counter invaders from the Manchu-led Qing Empire.