The person who was closest to Emperor Guangwu had a regret medicine called Li Mi not entering the Pass, first, That Li Mi had the favorable conditions of the "Mandate of Heaven" Second, Li Mi occupied an excellent geographical advantage, and third, Li Mi had the most powerful strength at that time1. 2. A major misjudgment of the strength of the Sui Dynasty 3. The most important reason: insufficient execution Conclusion:

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