In 1931, Ma Biao became leader of the Yushu Defense Brigade. He was the second brigade commander while the first brigade was led by Ma Xun. Wang Jiamei was his secretary during the war against Tibet. Ma Biao fought to defend Lesser Surmang against the attacking Tibetans on 24–26 March 1932. The invading Tibetan forces massively outnumbered Ma Biao's defending Qinghai forces. Cai Zuozhen, the local Qinghai Tibetan Buddhist Buqing tribal chief, was fighting on the Qinghai side against the invading Tibetans.
