Murong Ren

Murong Ren left his post in Pingguo to attend his father's funeral at Jicheng (棘城, in modern Jinzhou, Liaoning). There, he expressed his worries to Murong Zhao about Murong Huang's excessively strict laws and how the two had not shown enough courtesy to him on multiple occasions. Zhao told him that as sons of their father and his chief wife, Murong Hui's territory should be divided between the three of them. Zhao then told Ren that he should return to Pingguo and raise his troops against Huang while Zhao stay behind and observe Huang's situation from within. Ren agreed with his plan, and after returning to Pingguo, he led his troops west in rebellion.[4]

Meanwhile, however, someone leaked Ren and Zhao's plans to Huang. Huang did not fully believe it at first, so he sent envoys to Ren to determine if this was true. Ren had arrived at the Huang River when the envoys reached him, and upon learning that his plot had been uncovered, he beheaded the envoys before returning to Pingguo. After forcing Murong Zhao to commit suicide, Murong Huang sent 5,000 troops under Tong Shou (佟壽) and Huang's half-brothers, Murong You (慕容幼), Murong Zhi (慕容稚), Murong Jūn and Murong Hàn (慕容汗; not to be confused with Murong Han) to campaign against Ren. He also sent his Army Libationer, Feng Yi to stabilize Liaodong.

Murong Ren fought his half-brothers and Tong Shou north of Wencheng (汶城), where he won a great victory. You, Zhi and Jūn were captured while Tong Shou, being a former subordinate of Ren, surrendered to him. The generals, Wang Bing (王冰) and Sun Ji (孫機), joined forces with Ren and handed him over Xiangping (襄平, in modern Liaoyang, Liaoning) while others such as Feng Chou (封抽), Yi Yi (乙逸), Han Jiao (韓矯) and Gao Xu (高詡) abandoned their cities and fled to Huang. Murong Hàn managed to escape and retreat with Feng Yi, who was unable to enter the region. The victory at Wencheng placed Liaodong under Ren's control, dividing Huang's territory into two.[5]

Almost immediately, Ren received the backing of the Murong's rival Xianbei clans, including the Yuwen and Duan tribes. Ren would coordinate attacks with the tribes against Huang throughout the rest of the war. In early 334, Ren appointed Zhai Kai (翟楷) and Pang Jian (龐鑒) as his own Colonel of Eastern Yi Tribes and Chancellor of Liaodong. Later on, he declared himself Inspector of Pingzhou and Duke of Liaodong.[6] Meanwhile, Duan Liao, the chief of the Duan tribe, began his moves against Murong Huang. Duan Liao sent his brother Duan Lan to attack Liucheng (柳城; southwest of present-day Chaoyang, Liaoning), but he could not capture the city. He later defeated reinforcements led by Murong Hàn and Feng Yi at Niuwei Valley (牛尾谷; north of Liucheng) but was unable to follow up on it as objections from Murong Han, now a general of the Duans, forced him to retreat.

In August, Murong Ren detained Jin envoys at Mashi Crossing (馬石津, southwest of Dalian, Liaoning) who were on their way to grant Murong Huang his late father's titles. In December, Huang's forces reached Xiangping. A man named Wang Ji (王岌) secretly offered Huang to surrender the city, so Huang occupied the city with ease while Zhai Kai and Pang Jian fled on their horses. Jujiu (居就), Xinchang (新昌) and other counties also surrendered to Huang, and Huang had the major families in Liaodong divided and relocated to his capital in Jicheng. Ren attacked Xinchang a few months later but was driven away by Wang Yu (王寓), who proceeded to relocate the people of Xinchang to Xiangping.

Near the end of 335, Murong Ren decided to release the envoys he had apprehended to allow them to return south. However, they instead decided to go to Jicheng first, granting Huang his titles. Meanwhile, envoys from the Duan and Yuwen tribes were at Pingguo and sleeping outside the walls of the city. Huang ordered his general Zhang Ying (張英) to ambush them. Zhang killed ten people from the Yuwen while capturing the Duan envoys and bringing them back to Huang.[7]

Murong Huang launched his final campaign against Murong Ren in February 336. Throughout the civil war, the Bohai Sea was said to have frozen over at least three times, and that February proved to be the third time this occurred. Huang took the daring decision to carry out a surprise attack on Ren by crossing the frozen sea. With Murong Ping and others under his wing, Murong Huang led his army to cross roughly 150 kilometres (93.21 miles) over the Bohai and successfully reached Lilinkou (歷林口, west of the lower reaches of the Liaohe River). There, they abandoned their baggages and made a quick march towards Pingguo.[8]

As Huang approached Pingguo, Ren's scout quickly notified him of the threat. Ren had been irked by his failure to stop Zhang Ying the previous year, so this time, he wished to rush out in hopes of actually destroying his enemies. He mistakenly believed that the threat was merely a small force carrying out a raid, unaware that Huang had come with a large force. Bringing out his whole army, Ren marched northwest of his city to mount his defence. Once Huang's army began to advance, however, Murong Jūn brought his soldiers to defect to Huang's side, which immediately demoralized Ren's troops and stopped them in their tracks. Because of this, Huang easily dispatched Ren's soldiers and dealt him a decisive defeat.

Murong Ren tried to flee from the scene, but his personal riders betrayed him and turned him over to Huang. The riders, however, were ordered by Huang to be executed for treachery, while Ren was forced to commit suicide in similar fashion to Murong Zhao. A number of Ren's partisans were executed while the rest fled east to seek refuge with Goguryeo, some dying to Huang's pursuers in the process. The others were forgiven and allowed to serve in Huang's administration.[9] Ren's defeat allowed Huang to reunify his territory, although he still had to deal with the constant attacks from the Duan and Yuwen for the next few years, both of which he ultimately subjugated.