While others were exiled and awaiting death, he was exiled and built a city.
My grandfather left behind a "Manuscript of Jian'an Studies", which records the wisdom of three generations of the Gu family: water conservancy, fortifications, farming, and military training.
With this book, he dug a well in a deserted land, built a fortress in three months, and trained more than 10,000 defeated bandits into an iron army within a year.
The imperial court sent 25,000 elite troops to suppress the enemy, and he used fortifications to teach people how to behave.
Beirong's 15,000 cavalry invaded. He used the Mo Dao Formation and cavalry tactics to make a comeback.
There is no system, no time travel, just relying on the knowledge inheritance of three generations.
From a prisoner abandoned by the imperial court, to a self-respecting military envoy, to the founding emperor——
This book is his only capital for a comeback.