then modern central Jiangsu). Emperor Cheng's uncle Yu Yi (庾翼) was impressed with his talent, and often endorsed him for even greater responsibilities. During Emperor Kang's brief reign, Huan was one of the few officials who supported Yu's plan for a northern campaign against Later Zhao in 343, although Yu's plan was never actually carried out. After Yu's death in 345 (during the reign of Emperor Mu, then a toddler), the chancellor He Chong (何充) commissioned Huan to succeed Yu, as the commander of the military forces in the western provinces (roughly modern Hubei, Hunan, Guizhou, and Yunnan), even though some other imperial officials had misgivings about Huan's ambitions and independence. Campaign against Cheng Han Soon after taking over for Yu, the ambitious Huan turned his attention west, wanting to destroy Cheng Han, whose emperor Li Shi had mismanaged his state and lost the trust of his people. Most generals had concerns about the geographic barriers that isolated Cheng Han (which occupied modern Sichuan and Chongqing) from Jin, and that Later Zhao might make a surprise attack if it realized that Jin's forces were attacking Cheng Han. Late in 346, he launched the campaign. Li Shi sent his uncle Li Fu (李福), cousin Li Quan (李權), and Zan Jian (昝堅) to lead his forces to resist Huan, but Huan defeated Li Fu and then, abandoning most of his supplies and traveling light, quickly arrived in the vicinity of Cheng Han's capital Chengdu. Zan Jian's forces, in fear, collapsed, instead of being able to regroup to try to save Chengdu. However, Li Shi gathered the remaining troops and mounted a counterattack that was initially successful. Huan, in fear, ordered retreat—but his signal officer, in panic, beat his drums (signifying attack) rather than his gong (signifying retreat). The Jin forces attacked harder and defeated Cheng Han forces, allowing Huan to march upon Chengdu's gates. Li Shi fled, but soon had a messenger submit a humble surrender petition to Huan. He then surrendered in person after binding himself and bringing a coffin—signifying readiness to be executed. Huan released him and escorted him to the Jin capital Jiankang, where Emperor Mu pardoned him and created him a marquess. To reward Huan, Emperor Mu created him the Duke of Linhe. Mutual suspicion with imperial officials The victory over Cheng Han, however, brought fear in imperial officials that the ambitious Huan intended to control the government.