Emperor Mu's granduncle Sima Yu, Prince of Kuaiji, in order to counter Huan, invited a renowned official, Yin Hao, to join in major decision-making with him and Cai Mo. This brought a rivalry that Huan and Yin had since their youth (when both were viewed as up-and-coming talent) into the open. The rivalry intensified after Yin seized more power late in 350 after accusing Cai of being disrespectful to the emperor (by repeatedly declining an honor that was being bestowed on him) and demoting Cai to commoner status. Over the next few years, as Later Zhao collapsed in the midst of internecine wars between the emperor Shi Hu's sons and adoptive grandson Shi Min after Shi Hu's death in 349, Huan repeatedly requested the imperial government to authorize him to advance north to try to recover northern China for Jin, but he was repeatedly rebuffed, even after a campaign by Emperor Mu's maternal grandfather Chu Pou (褚裒) ended badly. Around the new year 352, Huan, upset that his requests were being repeatedly denied, mobilized his troops and gestured as if he were about to attack the capital. Yin was shocked, and initially considered either resigning or send the imperial banner of peace (Zouyu Fan, 騶虞幡) to order Huan to stop. After advice from Wang Biaozhi (王彪之), however, he instead asked Sima Yu to write a carefully worded letter to Huan, persuading Huan to stop. Yin, meanwhile, was preparing his own campaigns, and he launched one campaign in the middle of 352 and one late in 352—the second one being thoroughly disastrous, as he offended and intimidated the general Yao Xiang (姚襄) into rebellion, and was ambushed by Yao at great loss of life and materials. The people despised Yin for his military losses, and Huan submitted a petition demanding Yin's ouster. The imperial government was compelled to demote Yin to commoner status and exile him. From that point on, the imperial government largely no longer dared to deny Huan's requests. Northern campaigns Against Former Qin With Yin out of the picture, Huan launched a major attack against one of Later Zhao's successor states, Former Qin, in 354. His army defeated much of Former Qin's resistance, reaching all the way to the vicinity of Former Qin's capital Chang'an—but Huan hesitated at making one final assault against Chang'an. It was at this time that Huan met Wang Meng, who came to see