The most important thing is that the best way for primitive accumulation isn't toiling in the fields, but plunder. You always need a target nearby that you can beat up, right?
The wild people had already charged down, converging on the stockade from all directions. Thankfully, Zheng Fan had a good habit when it came to warfare, a habit born from a lack of confidence in his own military command abilities. He didn't understand any wildly imaginative military stratagems, but he at least understood the principle that making fewer mistakes was always a good thing.
