Traveling through time and becoming Guiguzi's last apprentice, you don't need any military strategies. The master was so angry that his beard stood up: What do you want to learn? I pointed to the foot of Yunmeng Mountain: learn farming, road construction, and steelmaking. He was dumbfounded: I have been teaching the art of vertical and horizontal movements for hundreds of years, but you don't want to learn this? Later, when Ying Zheng unified the six countries, they were short of food and weapons. I dragged a cart of new farm tools and ironware to Xianyang: Your Majesty, this is what I call hard work to rejuvenate the country! Guiguzi scolded from behind: Traitor! You changed all my luck in the art of war into productivity!