Chapter 67: The Philosophy of "That Strip" He turned toward the map, his gaze falling upon the winding imperial road leading from Chang'an to the northern frontier. That was the grain transport lifeline, as well as the essential route the Great Tang's iron cavalry had to take for their northern expedition! "Firm enough..." Li Shimin muttered to himself, "Is he hinting to me that the resolve for this northern expedition must be firm, and our logistical support just as solid?" "Long…