Huan Guo's Northern Expedition progressed smoothly, and six counties of Dongping, Fengfu, Laizou, Jiyang, Rencheng and Gaoping of Fu State were captured. Prince Xiao Shu of Fu State stationed in Qu'an City for defense. In March, Huan's army captured Niujijin, 120 miles southwest of Qu'an, and the entire army attacked Qu'an. Huan Jun had many soldiers and sophisticated equipment, and the city of Qu'an was in danger. The Huan army took turns to attack, and continuously attacked the city with hooks, ladders, rams and other equipment. Rockets were fired into the city and set fire to houses. The Huan army ascended the city in stages, falling and rising again, with no one retreating. Xiao Shu commanded the soldiers to fight desperately at the top of the city, killing the Heng soldiers who came up.
Huan Jun attacked Ban Yue fiercely.
When Fu Jun's 50,000 infantry and cavalry reinforcements were about to arrive, the city of Qu'an was destroyed. When the news reached Futai Palace in Pingdu, Emperor Fuwen was so sad that he vomited blood and soon fell ill and died.
In June, the brilliant results achieved by Huan's army were in vain. The Heng army retreated in defeat. After that, Hengguo was temporarily unable to rise again, so it rectified its politics and restored its national strength in order to rise again. Fu Guo adopted an "alliance" policy and sent Yuan Yu, the Taizhong official, as envoy to Qiong to persuade Emperor Qiong to resist Huan and establish an alliance.
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