Map of the Kingdom's Warfare.

Summary

The chapter describes a fierce battle at Tumen Pass, where the Sui army, consisting of 3,000 soldiers, launches an initial assault but faces strong defenses set by Qu Tutong, who has prepared trenches and stationed crossbowmen. The Sui soldiers suffer heavy casualties from crossbow fire and hidden iron thorns, leading to a retreat. However, the Sui regroup and launch a second wave of over 5,000 soldiers, overcoming the initial defenses and engaging in brutal close-quarters combat on the city wall. Despite Qu Tutong's strategic efforts, the ferocity and experience of Luo Shi Xin's troops turn the tide of battle, forcing Qu Tutong to order a retreat. Meanwhile, Zhang Xuan is coordinating efforts elsewhere, successfully intercepting Sui forces, while Sang Xianhe, a former Sui general, faces a dilemma after receiving a letter from Zhang Xuan offering him a chance to surrender or face annihilation. Ultimately, Sang Xianhe decides to surrender, leading his men out of Zhen Ding County to join the Sui army.

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