In 719 AD, the Western Zhou Dynasty attacked the Eastern Qi Dynasty, and the Emperor's Wall War broke out. In the early days, Dong Qi's organization and dispatch were poor, and the southern, northern, and western fronts were successively lost. Emperor Qi Liefenglong Nobunaga died in the rebellion. His younger brother, Liefeng Long Nobuo, came to the throne and defended the western front. At the same time, he sent out surprise troops to regain the lost territory in the north and south and control the ports. In the 721st year of the King's calendar, Qi Emperor Liefeng Long Xinxiong and Zhou Emperor Meiying Zhenyu made an appointment to fight at Qinglong Bay. Liefeng Long Nobuxiong died in a single fight, Zhen Yu was seriously injured, and was rescued back to Zhoudu Guangcheng. None of the Long Xinxiong brothers had any heirs, so Liefeng Chai Jiayu, a "dao hero" who lived among the people, came to the throne. Chai Jiayu led the Western Expedition, fought bloody battles at Jinjiang, and fought a decisive battle with the Western Zhou army in Heishan, wiping out its main force. The remnants of the Western Zhou army retreated to Guangcheng. The Eastern Qi army crossed the Black Mountains and aimed directly at the Zhou capital.
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