Three Thousand Side Gates

He practiced three ambushes in the summer and three nines in the winter, but he was no match for seven or eight foreign guns. An army of a hundred men can attack mountains with artillery, but it can't do anything to deal with demons and monsters. Martial arts declined, Taoism and Buddhism declined, mountains and rivers eclipsed, and the times went haywire. I have a book that can transform three thousand side doors and lead to the main road.