Yao Chang
In 389, after losing several battles to Former Qin, Yao Chang became apprehensive and thought that it was Fu Jiān's spirit aiding Former Qin, so he, following Fu Deng's lead, made an image of Fu Jiān and worshipped it, claiming to it that he had killed Fu Jiān only to avenge Yao Xiang and asking for forgiveness. The image did not help Yao Chang, and he eventually cut off its head and sent it to Fu Deng. Later that year, as Fu Deng was pressuring Yao Chang, however, Yao Chang made a surprise attack at night, around Fu Deng's army, against Fu Deng logistics base Dajie (大界, in modern Xianyang, Shaanxi), capturing it and Fu Deng's wife Empress Mao and killing his sons Fu Bian (苻弁) and Fu Shang (苻尚). He initially wanted to make Empress Mao his concubine, but after she cursed him, he executed her. While Former Qin and Later Qin would continue to stalemate for the next few years, Fu Deng was unable to again threaten Later Qin's existence from this point on.