Gods and Demons Great Qin, How Did the 500,000-Strong Border Army Lose at the Beginning?

I am Fusu. I am reborn, but I am reborn with the memories of two lifetimes. In my previous life, I was tricked into committing suicide by Zhao Gao's false edict. In my previous life, I became a top student in the history department in the 21st century. I have been familiar with China for five thousand years, but I was deceived by the girl I liked. The last thought before I died was: not to talk about love dogs.