Oops! I Became a Bandit Chief

When foreign cavalry ravage the land and the imperial court flees south, Lu Polu wakes up to find himself the leader of a bandit gang formed from defeated soldiers and refugees, with enemy scouts searching the mountain below. Awakening the memories of a modern special forces soldier, he has no system but relies on guerrilla tactics and homemade gunpowder formulas. Using three-by-three infantry tactics and night raids, he transforms the bandits into a special forces army. While the court cedes territory and pays reparations, his "bandit" army breaks through the north. "Since the court is weak, I'll take the throne and destroy the invaders!"