Lin Yan, a modern military engineer, unexpectedly transmigrates into the post of squad leader in the Yanmen border army of the Great Yong dynasty. Just as he arrives, Yanmen suffers a crushing defeat. Only thirteen wounded soldiers remain of the three thousand border troops, the Northern Barbarians’ cavalry is sharpening its blades, the court is corrupt, supplies and pay have run out, and the northern frontier is on the verge of collapse.
He has no large force, no heavy armor, and only the military engineering knowledge etched into his bones.
He reforges broken spears into sharp blades, uses hemp ropes to lay formations, and slays Northern Barbarian raiders with improvised devices. He takes Blackwind Ridge as his stronghold, gathers scattered troops and rallies the brave, then uses military engineering to build weapons and devise tactics.
From thirteen wounded soldiers to a mighty northern army, from the Blackwind Ridge outpost to the formidable Yanmen Pass, he sharpens iron into a blade and turns blood into a shield, protecting the people of Great Yong and holding back the Northern Barbarians’ ten thousand horsemen.
The flames of war rise across the land, and drums of battle thunder in the north. See how a low-ranking military engineer takes command of the border army, crushes the Northern Barbarians, and ensures the northern frontier of Great Yong will never again be engulfed in smoke!
