The adversarial relationship continued even after Jing's removal as chancellor, such that Later Jin was eventually destroyed by a Liao invasion.
He later served under Yin Hao (尹皓), who commanded the army at Hua Prefecture (華州, in modern Weinan, Shaanxi).
Jing later served under the prominent general Wang Yanzhang in resisting the army of Li Cunxu, the prince of Later Liang's archrival Jin.
[1] Later, after Li Cunxu claimed the title of emperor of a new state of Later Tang and launched a surprise attack into Later Liang territory, Wang made a futile attempt to try to stop him at Zhongdu (中都, in modern Jining, Shandong).
[5] Jing suffered several serious wounds during this battle, and was captured by the Later Tang army and taken by them to Daliang,[1] which fell to Li Cunxu.
Then-military governor of Xuanwu, Zhu Shouyin, believed that Li Siyuan was intending to act against him, rebelled, but was quickly defeated, and he committed suicide.
Later, apparently after Shi became the military governor of Hedong Circuit (河東, headquartered in modern Taiyuan, Shanxi), Jing came to serve under him as a "guest general" (客將, kejiang).
Subsequently, Emperor Taizong of Later Tang's northern rival Khitan Empire came to Shi's rescue and defeated Zhang.
[7] He was also given the honorary titles of acting Situ (司徒) and military prefect (團練使, Tuanlianshi) of Guo Prefecture (果州, in modern Nanchong, Sichuan, then ruled by Later Shu).
[1] In 939, Jing was sent out of then-capital Daliang to serve as the military governor of Yicheng Circuit (義成, headquartered in modern Anyang, Henan).
However, after Shi Jingtang died shortly after, Feng discussed the matter with Jing, and they decided that as the realm was troubled at the time, the state needed an older emperor.
Shortly after Shi took the throne, he was made the commander of the imperial guards, as well as chancellor (with the designation Tong Zhongshu Menxia Pingzhangshi (同中書門下平章事).
[8] He was also apparently given the military governorship of Tianping Circuit (天平, headquartered in modern Tai'an, Shandong), but remained at Daliang.
Jing, however, advocated a letter (to show equality between the states) and having Shi Chonggui refer to himself as "your grandson" and not "subject."
Jing, arrogantly, stated to him:[8] Tell your master: the deceased emperor [(i.e., Shi Jingtang)] was placed in his position by the northern dynasty [(i.e., Liao)], and that is why he claimed himself to be a subject and submitted reports.
[8] Meanwhile, while Shi Jingtang was alive, he had lent 300 horses from the imperial guards corps to Yang Guangyuan the military governor of Pinglu Circuit (平盧, headquartered in modern Weifang, Shandong).
Later Jin's prefect of Bo Prefecture (博州, in modern Liaocheng, Shandong), Zhou Ru (周儒), who was in secret communications with Yang Guangyuan, surrendered Bo to Liao forces, and encouraged them to cross the Yellow River at Majiakou (馬家口, in modern Liaocheng), to join forces with Yang.
As a result, Liao forces put three key Later Jin generals, Gao Xingzhou, Fu Yanqing, and Shi Gongba (石公霸), under siege at Qicheng (戚城, in modern Puyang, Henan), and the city nearly fell.
[9] It was said that the demotion from chancellorship depressed Jing Yanguang, who was also beginning to realize that Liao's strength would eventually endanger both himself and the state.
Meanwhile, as the campaign that repelled Liao drained the imperial treasury, Shi Chonggui sent out 36 emissaries to the various regions of his realm to have the local governments extract wealth from the people forcibly.
Jing, wanting to extract more, offered 370,000 coins, but his assistant Lu Yi (盧億) rebuked him for benefitting himself at the people's expense, and he stopped.
[9] In 945, Emperor Taizong made another major incursion into Later Jin territory, advancing to the vicinity of Yedu (鄴都, in modern Handan, Hebei).
Still, under Sang Weihan's advice, Shi Chonggui sent the emissary Zhang Hui (張暉) to Liao, seeking peace.
He had Zhao Yanshou write to Du, offering to surrender Lulong Circuit (盧龍, headquartered at You Prefecture) to Later Jin.
Emperor Taizong also summoned Qiao Rong to list 10 things that Jing did that he believed led to the enmity between the states.