Chapter 1833

But if we build a Great Wall, using the steamed earth method to build a Great Wall that runs through the key passage of Hexi.

The Xiongnu can climb over, but what about the warhorses?

Actually, building a Great Wall to defend against the Xiongnu is not something that hasn't been proposed before.

But the entire Da Qian border is too vast, and the cost would be astronomical, making the feasibility too low.

But the terrain of Hexi is special; this unique terrain dictates that the cost is within a controllable range!

"Wonderful!"

"From Jiju to Yumen Pass, setting up beacons every five miles and building garrison forts every ten miles is highly feasible!"

Shangguan Wan'er looked at Gao Yang and then asked, "But what if the Xiongnu bypass the main Great Wall and kill their way into Hexi? What should we do then?"

Gao Yang smiled and said, "Bypass? If they dare to bypass, they will surely die."

"Chancellor, do you have other means?" Wu Zhao asked, her voice ringing out.

Gao Yang said, "Your Majesty only needs to dig 'Heavenly Fields' and plant 'thorny willows' thirty miles outside the Great Wall. These Heavenly Fields are strips of fine sand, and the thorny willows are thorny red shrubs!"

"I have measured the wind speed in the Hexi region with trigonometric functions; the wind is not strong, and human footprints can be easily covered, but the depth of horse hoofprints in the fine sand strip can reach three to five inches!"

Gao Yang chuckled and continued, "Heh... to smooth out hoofprints of this depth, unless there is a level-twelve gale, it is absolutely impossible!"

"We only need to order the soldiers to patrol twice a day, at the Chen and Shen hours. If the hoofprints are deep, there are many people; if the prints are shallow, the horses are tired. We can even calculate whether the Xiongnu are carrying supplies!"

Wu Zhao's pupils shrank: "You mean, the Xiongnu's movements are all under our army's control?"

"Not only can our army grasp the Xiongnu's movements, but I also want to make the Xiongnu people throw themselves into the net!" ===== CHAPTER 1835 =====