After Chang Yuchun's death, Chang Mao inherited his father's title and was conferred the title of Zheng Guogong by Zhu Yuanzhang. Chang Mao is quite similar to his father Chang Yuchun, and he is also a valiant soldier. 1387, Changmao followed Aquamarine and Shengfeng in the Northern Expedition, and conquered Naha Chu, the commander of the Yuan Dynasty. The desperate Naba Chu agreed to surrender. Aquamarine and Shengfeng are very happy. They held a banquet for Naha Chu as a gesture of friendship.

Unexpectedly, aquamarine was drunk at the banquet, and he was very happy. According to Chinese etiquette, he took off his coat and put it on Naha. Naha didn't understand the meaning of aquamarine and thought it was an insult to them, so he was very angry.

Nabachu whispered to the Mongolian guards around him, but was heard by Amin soldiers who knew Mongolian. The soldier quickly told Chang Mao that Naha Chu was pretending to surrender and was ready to defect again.

Chang Mao didn't have time to report to Shengfeng after learning the news, so he decided to intercept Naha without authorization. In the fight, Chang Mao accidentally cut the arm of Naha Chu, causing other Yuan soldiers of Naha Chu to escape. Originally, the work of peaceful reception was not completed, and Zhu Yuanzhang was furious when he heard the news. Later, Shengfeng explained the situation to Naha, and Naha agreed to surrender again.

This incident directly led to the punishment of aquamarine, Shengfeng and Changmao. Liang Guogong, who was originally chased by Aquamarine, was changed to "Liang Guogong", Feng was deprived of the military power of the general, and Changmao was exiled to Longzhou (now Guangxi). Only four years later, Changmao died in Longzhou.

Chang Yuchun's life experience:

Chang Yuchun (1330—1369) was born in Huaiyuan County (now Huaiyuan County, Bengbu City, Anhui Province) and Yan Heng. An outstanding general of the Red Scarf Army at the end of Yuan Dynasty and a founding star of Ming Dynasty.

In the fifteenth year of Yuan Shundi (1355), he joined Zhu Yuanzhang, hired a striker and fought hard to defeat the enemy, which made hundreds of thousands of people spread all over the world. The army said that there were often hundreds of thousands, officials in charge of military affairs, and princes, who had little protection, sealed lord protector, Hubei.

In the second year of Hongwu's northern expedition to the Central Plains, he died suddenly in the army. He is only forty years old. He used the story of Song Taizong's loss of Zhao Pu, the king of Korea, as a posthumous gift to Yi Yun, the hero of Xuande Jingyuan, the Third Division of Kaifu Instrument, the Prime Minister of the Lord Taibao and Zhongshu, as a posthumous gift to Kaiping King and posthumous title Zhongwu, and they deserved to enjoy the ancestral hall.