During the process of occupying Lingnan, Feng Ang demonstrated excellent military talent and leadership. After the fall of the Sui Dynasty, he returned to Lingnan and quickly gathered a force of 50,000 men. Subsequently, Feng Ang attached himself to the warlord Lin Shihong in Lingnan, and took Cangwu, Gaoliang, Zhuya, and Fanyu as his bases.

In the third year of the Tang Dynasty's Wude period, Feng Ang faced the rebellion of the bandit leaders Gao Facheng and Xian Baoche in Guangzhou and Xinzhou. He led his army to successfully defeat them. However, Xian Baoche's nephew, Xian Zhichen, regrouped his army in Xinzhou and confronted Feng Ang. During the battle, Feng Ang took off his helmet and shouted loudly, causing most of the enemy troops to surrender and bow to him. Feng Ang successfully captured Xian Baoche, Xian Zhichen, and others, and subsequently occupied Guangzhou, Cangwu, and Zhuya, and claimed himself as the general manager.

At that time, some people suggested that Feng Ang adopt the title of "King of Nanyue", but Feng Ang humbly stated that he dared not emulate Zhao Tuo's act of claiming kingship. He believed that his family had lived in the Baiyue region for five generations, and the area under his jurisdiction only belonged to his surname. Feng Ang was deeply aware of his great responsibility and afraid of not being able to bear this heavy burden, lest it bring disgrace to his ancestors. Therefore, he insisted on governing Lingnan as the general manager and stabilized the situation in the region, ensuring social tranquility.

On the 18th day of the fifth year of the Wude period, Feng Ang accepted the summons of Li Jing, a famous general of the Tang Dynasty, and led his troops to submit to the Tang Dynasty. Shortly afterwards, Feng Ang was granted the title of "Geng Guo Gong" by Emperor Gaozong of Tang.

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