爾朱兆
Despite this, Gao remained nominally under the Erzhus' command structure, and when, around the new year, the general Gedouling Bufan (紇豆陵步番), loyal to Emperor Xiaozhuang, attacked Erzhu Zhao and initially defeated him, approaching Jinyang, Gao came to Erzhu Zhao's aid, and together they defeated and killed Gedouling. After the battle, Erzhu Zhao and Gao swore themselves to be brothers. Erzhu Zhao, trusting Gao, commissioned him with Ge Rong's former troops (largely Xianbei) and, accepting his suggestion, allowed him to take his new troops east of the Taihang Mountains to seek food.