Lin Yi listened as Song Lin analyzed the battle situation with clear logic, nodding inwardly. When she heard him say that Gu Fang would likely drive the Northern Frontier people back north of the Yin Mountains within a month, she frowned slightly. "If that's the case, my husband is very likely to keep fighting. But we know too little about the area north of the Yin Mountains—the terrain, the roads—we're only half-informed. Establishing a supply line would be very difficult."
Song Lin nodded. "Exactly. So I think the most urgent thing now is to build new logistic points as soon as possible. Since we're unfamiliar with the land north of the Yin Mountains, we should first reinforce the road from Jiuyuan Commandery to the Yin Mountains pass with concrete to ensure smooth supplies for now. Once Nianqing drives the enemy away, we can set up temporary supply points along the way as we advance."
Lin Yi recalled the geographical features of that area, her frown deepening. "I agree with the first part, but the latter might not be feasible. North of the Yin Mountains is a dust zone with strong winds and sand. We can't lay concrete roads there now. Without roads, we could easily get lost in the desert."
Song Lin sighed softly. "Can't we? I've only seen finished concrete roads; I don't know the specifics of laying it. I heard concrete uses sand and stones, and I thought since there's plenty of sand there, it might be easier."
Lin Yi shook her head. "I'm not sure either; I haven't tried. Sand has poor bearing capacity, high fluidity, and drains too quickly. In theory, you can't lay concrete directly on it." She paused, as if thinking. "But if we reinforce the foundation, maybe it's possible. I'll need to think it over."
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