Ge Rong’s rebellion In 528, Gao Aocao and Gao Qian started a rebellion between the
Yellow and
Ji rivers. They joined forces with the rebel,
Ge Rong and received official titles from him. The brothers repeatedly defeated the Wei armies sent to quell them, but eventually, Gao Qian decided to surrender when he received a direct order from
Emperor Xiaozhuang of Northern Wei, who was a childhood friend. Gao Aocao followed his brother in surrender, and he was appointed Communications Cavalier Regular Attendant and bestowed the title of Earl of Wucheng County. However, the paramount leader of Wei,
Erzhu Rong, thought it inappropriate that the Gao brothers, only recently rebelling, be granted important titles and thus sent them home. Back in their hometown, the brothers gathered more followers and resumed their plundering. Subsequently, Erzhu Rong secretly ordered the governor, Yuan Yi (元嶷) to capture Gao Aocao and imprison him at
Jinyang.
Brief service under Emperor Xiaozhuang When Erzhu Rong returned to the capital, Luoyang in fall 530, he brought along Gao Aocao and locked him up in the Camel and Oxen Bureau. On 1 November, Erzhu Rong was ambushed and assassinated by Emperor Xiaozhuang, who had become apprehensive of his overbearing power over the government. Gao Aocao was freed after the assassination, but now, Luoyang was threatened by Erzhu Rong’s family members from all directions. He was grateful for his release, and when Xiaozhuang personally went to the Daxia Gate (大夏門; on the northern wall of Luoyang) to command the troops, he “donned his armour and grabbed his spear, volunteering himself to fight against the invaders. Together with his nephew, Gao Changming (高長命), he led the army forward and was unbeatable, impressing many onlookers including the emperor himself. Hearing the situation in Luoyang, Gao Qian rushed to the capital from
Ji province to support the emperor. Xiaozhuang assigned Gao Qian as Ambassador to Hebei and Gao Aocao as General of the Guards before ordering them to return to their hometown to recruit more soldiers. Just as they were about to leave, the emperor brought them to the bank of the Yellow River, raised his wine cup, pointed at the river and told them, “You brothers are the true heroes of Ji province, capable of rousing soldiers to fight to the death. If any change befalls the capital, you may raise dust for me along the river.” Gao Qian tearfully accepted his order, while Gao Aocao drew his sword and performed a dance, swearing to die.
Rebellion in Xindu and joining Gao Huan In January 531, Luoyang fell and Emperor Xiaozhuang was executed by the Erzhu forces. Upon receiving the news, Gao Aocao, his father and brother took up arms in
Xindu. The Inspector of Yin province, Erzhu Yusheng (爾朱羽生) brought 5,000 soldiers to quell their uprising. As the attackers encroached on to their city, Gao Aocao, with not even time to wear his armour, reportedly led a few dozen cavalrymen out to face them. Gao Qian was worried that his brother would be defeated, so he lowered 500 men with ropes down the city walls to chase after him. However, by then, Gao Aocao had fought and defeated Erzhu Yusheng. Soon, Gao Qian contacted the Inspector of Jin province, Gao Huan and offered him to lead the rebellion against the Erzhu family and welcome him to Xindu. Gao Aocao was away on a campaign at the time and was unhappy by the decision. He disparaged his brother by mockingly sending him women’s clothing and refusing to return to Xindu. Gao Huan was also member of the Gao clan of Bohai, albeit a very distant relative of Gao Aocao and his branch. To win him over, Gao Huan sent his son, Gao Cheng to meet Gao Aocao with the proper etiquette due for a granduncle. Finally convinced by Gao Huan’s sincerity, Gao Aocao returned to Xindu together with Gao Cheng.
Battle of Hanling In October that same year, Gao Huan installed
Yuan Lang as the new emperor, and Gao Aocao was given tally and appointed Inspector of Ji province and Senior General of Chariots and Cavalry. He was later promoted to Grand Chief Controller and followed Gao Huan in defeating
Erzhu Zhao at Guang’a (廣阿, in modern
Xingtai,
Hebei). In 532, Gao Huan faced the Erzhu clan in a decisive battle at Hanling. Among Gao Huan’s military cabinet, Gao Aocao led the largest contingent of Han Chinese troops, with two of his subordinate generals, Wang Taotang (王桃湯) and Dongfang Lao (東方老), also being Chinese. At the time, the Chinese were mostly agrarian farmers while the Xianbei were seen as combat-ready people. Gao Huan voiced his concern to Gao Aocao about the capability of his Chinese troops and suggested that he send his Xianbei cavalry against the enemy instead. However, Aocao stated that his troops were well-trained and had fought in many battles, insisting that Gao Huan dispatch him without the need of the Xianbei. Thus, his request was granted, and he accompanied Gao Huan with 3,000 of his own troops. During the initial bout, Gao Huan was defeated by Erzhu Zhao and issued a retreat, enticing the latter to take advantage by pursuing him. Erzhu Zhao’s forces were eventually held up in the front by Gao Huan’s general,
Gao Yue while another general,
Hulü Jin gathered his scattered soldiers and attacked Erzhu Zhao’s rear. Then, Gao Aocao and Cai Jun (蔡俊), with 1,000 soldiers, marched out from Liyuan and led an assault on Erzhu Zhao’s flank. Gao Huan’s generals dealt the Erzhu forces a great defeat, scattering their leaders and allowing Gao Huan to occupy Luoyang. For his contributions, Gao Aocao was appointed Palace Attendant and bestowed the title of Marquis of Wucheng County. == Campaign against Emperor Xiaowu ==