Map of the Kingdom's Warfare.

Summary

Shi Huai Yi, a general under Li Xiao Gong, was captured by the Sui army but refused to surrender. Admired for his spirit, he was imprisoned instead of executed. Li Xiao Gong, trusting his subordinate, appointed him as the vanguard upon his return. Shi Huai Yi bravely led the charge into the city of Wu Guan, which the Tang army captured. However, Li Xiao Gong was puzzled by the Sui army's retreat. Huo explained that the Sui's real goal was to drive the Tang out of Shangluo County. Li Xiao Gong decided to retake Shangluo County, sending a contingent to defend Wu Guan while he led a larger force northward. Concurrently, Liu Lan Cheng of the Sui army prepared to counter the Tang advance. The strategic importance of Shangluo County, with its rich resources and population, was highlighted. After retaking Wu Guan, Li Xiao Gong sought intelligence on the Sui army's movements and realized Liu Lan Cheng was likely leading a smaller force south. Huo suggested the Sui army might not engage in battle, prompting Li Xiao Gong to decide to seize Shangluo County before Li Shentong could arrive.

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