unable to capture Yao Xiang. However, one of Yao Xiang's officer, Yang Liang (楊亮), turned back and surrendered to Huan. Huan Wen asked him what kind of man Yao Xiang was, to which he said, "Yao Xiang has divine wisdom and a broad mind, just like Sun Ce, but in valor and martial prowess he surpasses even the latter". Campaign against Former Qin Not long after his defeat at Luoyang, Yao Xiang invaded Former Qin's Pingyang County. He placed the county's Administrator, Fu Chan (苻產), under siege at Fort Xiongnu (匈奴堡). Qin's Prince of Jin, Fu Liu attempted to help Fu Chan, but was driven back by Yao Xiang. Eventually, Yao Xiang captured Fort Xiongnu, executed Fu Chan and slaughtered his soldiers. Yao Xiang also received the surrender of Qin's Inspector of Bingzhou, Yin Chi (尹赤), who used to be one of Yao Xiang's subordinate. Yao Xiang then sent an envoy to Qin's emperor, Fu Sheng, demanding permission to cross his territory in order to return to Yao Xiang's homeland in Longxi. Fu Sheng at first considered agreeing to Yao Xiang's proposal, but at the advice of his cousin, Fu Jiān, who feared that Yao Xiang may become a threat to Qin in Longxi, refused. Instead, Fu Sheng sent his own envoys to confer Yao Xiang with ranks and titles. Fu Sheng hoped that this would put Yao Xiang at ease, allowing him to attack Yao Xiang while his guard was down. However, Yao Xiang rejected his ranks and titles. He beheaded Fu Sheng's envoys and burned their seals and books before sending them back to Fu Sheng. He then attacked and plundered Hedong Commandery, where he was able to capture Xiangling County (襄陵: in present-day Sui County, Henan). Qin's Grand General, Zhang Ping campaigned and eventually defeated Yao Xiang, prompting Yao Xiang to seek peace with Zhang Ping. The two men were able to befriend each other in the process, to the point that they swore an oath of brotherhood. In the end, they agreed to withdraw their army from one another. Death and posthumous honours In the summer of 357, Yao Xiang intended to conquer the Guanzhong region from Former Qin. Yao Xiang camped at Xingcheng (杏城, in present-day Yan'an, Shaanxi), where he sent Yao Lan (姚蘭) to attack Fucheng as well as Yao Yisheng (姚益生) and Wang Qinlu (王欽盧) to get the surrender of the Qiang people.