Perhaps The Will Of Heavens

Yan Liqiang suddenly laughed after hearing Eunuch Ou's words. He looked at Long Tiezhou and said, "In the Great Han Empire, there are two regions with the most grasslands. One is the western region and the other is the northern region. It will be easy for the Storm Army to access the grasslands on the territories they control. With grasslands, they can rear sheep and get wool. With wool, they will be able to make woolen fabric. With woolen fabrics, they will no longer have to worry about having their throat squeezed for the sake of money. In fact, the Storm Army won't even have to sell woolen fabric for long. As long as they have wool, countless people will come to begging for them. By then, exchanging wool for money, weapons, and food will not be a problem..."