Huo Duanshan, the former commander-in-chief who lost his arms and legs, was demoted as a military slave by the empire, but he regained control of the battle flag with steel prosthetics. The genius armorer Shen Chixiao secretly helped him create the bones of the lonely army, and the military doctor Su Yuan used flesh and blood technology to ignite the fire of rebirth. The enemy general Zhao Jin is lurking in the enemy camp, the rogue bandit Yan Jiuxiao is watching with eager eyes, and the privy envoy Cui Ming is weaving a death trap. Those who lose their limbs do not seek revenge, but reshape the soul of war - when the broken body leads thousands of armies, the iron law of the empire will eventually collapse in the roar of blood and iron.
