"I'm worried about fighting with my back to the wall, but you're worried about having no water to eat!" Zhao Hui laughed. He stood up and pointed to the wooden map with a long pole and said, "This is Jinji Fort. This ditch is the Heishui River. The lower reaches flow side by side with the Wawa River, sometimes dividing and sometimes merging. This water is the water of the snow-capped mountains...