Li Xiao, a modern military engineering specialist, opens his eyes to find himself transformed into the most infamous “useless duke” of the Jingnan Campaign: Li Jinglong.
Outside the tent, Yan cavalry is raiding the camp. Inside, an imperial edict from Emperor Jianwen demanding an explanation has arrived. His half-million-strong army is a force in name only, and the history books have already written his ending: defeat after defeat, opening the gates to surrender the city, and an infamy that will stain his name for generations.
Fortunately, a “spark of civilization” has come with him.
But it gives him no divine weapons or invincible legions. It offers only principles that can be put into practice in this era.
And so, from fixed ammunition packs, volley-firing firearms, and three-rank firing tactics to battlefield medicine, military supply reforms, and a newly integrated army, a force capable of facing Prince Yan’s cavalry head-on gradually takes shape.
When Zhu Di once again marches on Baigou River, everyone expects Li Jinglong to repeat history.
Instead, he draws his saber and looks toward the banner of the Prince of Yan:
“This time, the gates of Nanjing will not open for you.”
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