Yanwu was generous by nature, but he was also grumpy, treating human life like dirt. When he was eight years old, his father preferred concubines to his wife in the government. When Yanwu looked at his mother, she was very worried. She just picked up the hammer and went to chop the concubine. Only eight-year-old children kill people with their own consciousness, and the school is afraid of easy search. Ancient women, especially concubines, really had no human rights. After Yanwu hacked his concubine to death, he also blamed his father: "Is my minister thick or thin?" His father was humiliated by him, but after all, he was the eldest son, so he was lenient, just trying to ban him from learning martial arts so as not to get into trouble. However, it has been banned and cracked by Yanwu many times. Later, Yanwu went directly to join the army, starting at the grassroots level. Because of his talent, his popularity rose rapidly. After the Anshi Rebellion, Yan Wu followed Su Zongxi to participate in Lingwu Uprising, and then followed him to Fengxiang to Chang 'an. Wu Yan has a strong ability to resist foreign invasion. In July 764, he led the troops to the western expedition. The reason for the expedition was that Chengdu Yin was too comfortable to control Shu, and Tubo invaded, captured Longyou and directly won Chang 'an. Songzhou, Weizhou and Baozhou in northwest Sichuan were surrounded and finally fell. In July, he led troops to the war. In September, the Tubo army was defeated by more than 70,000 people, and Danggou City and Yanchuan City were captured in June+10 in 5438. At the same time, Cui Gang, the secretariat of Hanchuan, pursued Tubo in Xishan, extending the territory for hundreds of miles, and cooperating with Guo Ziyi's main battle in Qin Long, finally repelled the massive invasion of Tubo and defended the southwest frontier. He became famous after the battle. As a poet, he wrote a poem.