Map of the Kingdom's Warfare.

Summary

After defeating the Khitan, the Sui army, led by Li Chun, crossed the Liao Shui using floating bridges and gathered in Suicheng, preparing to march towards Wugucheng. Despite the narrow mountain paths hindering heavy transport, supplies were sent via sea, allowing the troops to advance quickly. In Wugucheng, Zhang Xuan and Fang Xuan Ling discussed the Goguryeo army's position and their supply issues, revealing that they were divided into two factions but dependent on a single commander for provisions. Zhang Xuan proposed a fire attack on the enemy's tents, but Fang Xuan Ling pointed out the camp's defenses. They devised a new plan to exploit a structural flaw in the camp. Li Kai, responsible for road construction, presented two new road plans to Zhang Xuan, who favored the longer, flatter route for better logistics. Zhang Xuan appointed Li Kai as Sima of Liaodong Prefecture, tasking him with long-term planning for road construction and military logistics, ensuring rapid troop deployment in case of rebellion.

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