Wubei Zhi

Wubei Zhi is a book that was written a long, long time ago in ancient China. It was written by someone named Mao Yuanyi who was a really smart person who knew a lot about military stuff. In the book, Mao Yuanyi wrote about everything that soldiers and generals needed to know about fighting battles and being in the army. He talked about things like how to make weapons, how to set up camps, how to train soldiers, and how to plan strategies for battles. It was like a big guidebook for anyone who wanted to be in the military, and it was really important because it helped lots of people learn how to be good at fighting wars. People still read the book today and learn a lot from it!