In 883, Huang Chao, under attack from a group of Tang
Shatuo generals led by
Li Keyong, was forced to abandon Chang'an and flee east. He had his general Meng Kai () attack Cai Prefecture. Qin Zongquan engaged Meng but was defeated, and reacted by opening the city gates and submitting to Huang. He thereafter joined his forces to Huang's. They put Chen Prefecture (陳州, in modern
Zhoukou,
Henan) under siege, but were unable to capture it due to the defense by Chen's prefect
Zhao Chou. In winter 883, when Huang was still sieging Chen, Qin himself put Xu Prefecture under siege, but was also unable to capture it. In spring 884, he also sent one of his younger brothers to attack Lu Prefecture (廬州, in modern
Hefei,
Anhui), and occupied Shucheng (舒城, in modern
Lu'an,
Anhui) for some time, before the prefect of Lu,
Yang Xingmin, sent his officer
Tian Jun to expel Qin Zongquan's brother. By summer 884, Huang had been defeated, and he was killed by his nephew Lin Yan (). However, Qin did not resubmit to Tang authority, and instead sent troops to pillage the surrounding circuits. In particular, he attacked
Zhu Quanzhong the military governor of Xuanwu Circuit (宣武, headquartered in modern
Kaifeng,
Henan), but with
Zhu Xuan the military governor of Tianping Circuit (天平, in modern
Tai'an,
Shandong) coming to Zhu Quanzhong's aid, Qin was defeated, and he withdrew. Meanwhile, in winter 884, when another renegade Tang general,
Lu Yanhong, was set to attack Xiang Prefecture (襄州, in modern
Xiangfan,
Hubei), Qin sent his officers Qin Gao () and
Zhao Deyin to aid Lu, and they captured Xiang Prefecture. Lu subsequently attacked Xu Prefecture and captured it, forcing Zhou Ji to flee, while Qin's forces took over Xiang Prefecture. Around the same time, Qin was also sending other officers to attack surrounding circuits, with Chen Yan () attacking Huainan Circuit (淮南, headquartered in modern
Yangzhou,
Jiangsu); Qin Zongxian () attacking Jiangxi Circuit (江西, headquartered in modern
Nanchang,
Jiangxi); Qin Gao capturing Shannan East Circuit (山南東道, headquartered at Xiang Prefecture);
Sun Ru capturing the Tang eastern capital
Luoyang, as well as Shanguo Circuit (陝虢, headquartered in modern
Sanmenxia,
Henan); Zhang Zhi () capturing Ru (汝州, in modern
Pingdingshan,
Henan) and Zheng (鄭州, in modern
Zhengzhou,
Henan) Prefectures; and Lu Tang () attacking Xuanwu. It was said that wherever Qin's army went, it slaughtered, burned, raped, and pillaged the territory, in even crueler ways than Huang's army did. Further, the army did not carry food supplies, and it committed numerous acts of
cannibalism. As, at that time, Emperor Xizong was planning to return from Chengdu to Chang'an but feared the display of force that Qin was making, he issued an edict trying to get Qin to resubmit, but Qin took no action on it. In spring 885, Qin ordered a nearby prefect,
Wang Xu the prefect of Guang Prefecture (光州, in modern
Xinyang,
Henan), to pay taxes to him. Wang was unable to due so due to lack of funds, and Qin, in anger, attacked him. Wang, in fear, forced the people of Guang and Shou (壽州, in modern Lu'an) to follow him south of the
Yangtze River. Qin also attacked Ying (潁州, in modern
Fuyang,
Anhui) and Bo (亳州, in modern
Bozhou,
Anhui), but Zhu Quanzhong repelled his attack. == As emperor ==