Sun Ru
At one point, when Zhongwu Circuit (忠武, headquartered in modern Xuchang) stationed an army at Cai Prefecture (蔡州, in modern Zhumadian, Henan) to defend against the major agrarian rebel Huang Chao, Ma Yin served in the Zhongwu army stationed at Cai, under the officers Sun Ru and Liu Jianfeng. By that time, Ma had become known for his abilities and bravery. Later, when Qin Zongquan the military governor of Fengguo Circuit (奉國, headquartered at Cai Prefecture) rebelled against the rule of Emperor Xuānzong's grandson Emperor Xizong, Sun and Liu, as well as their army, came under Qin's rule.