Map of the Kingdom's Warfare.

Summary

Chuluo Khan, unable to sustain the siege on Shanyang County, retreated south through Loufan Pass, dividing his 170,000 troops into two routes. He led 100,000 soldiers south while Kang Qiaoli remained with 70,000 in Mayi County, establishing defenses and relocating livestock to avoid Sui army interception. Meanwhile, Li Jing, commanding a 50,000-strong northern expedition, awaited the right moment to advance. He faced logistical challenges, realizing his supplies would only last ten days, with three already passed. After receiving critical intelligence from ragged Sui soldiers who escaped Turkic patrols, Li Jing adjusted his strategy to target the sheep and horse city at Zihe Pass instead of Qifu Bo. The Sui army increased their pace, planning to reach Zihe Pass while maintaining a coordinated formation.

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