Map of the Kingdom's Warfare.

Summary

Eulji Munduk learns of the Sui cavalry's entry into Liaodong, realizing the strategic miscalculation made by Goguryeo's leadership regarding Zhang Xuan's movements. Despite their earlier judgment that the Tang army would prioritize defeating Zhang Xuan, they failed to account for the threat posed by Xue Ju and others. Eulji decides to retreat to the Liao River while coordinating with Yuan Gai Su Wen's army. Meanwhile, Yuan Gai Su Wen contemplates his retreat options, ultimately deciding to head to Yancheng despite concerns about Sui interception. As the Goguryeo army hastily retreats, Sui scouts monitor their movements, and Pei Xingyan plans to prevent the unification of the Goguryeo forces, debating the timing of their attack. Song Zheng Ben urges immediate action to capitalize on the situation, warning of the risks of delay.

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