Shen Yue, a modern civil engineering student, was a young general from Yong'an City in the northern border. He took over a dangerous city that was running out of food and supplies. The rebel general Qin Zhao led an army of 50,000 to besiege the city, and his deputy general Zhou Jin prepared to fight to the death and die for his country. Shen Yue used concrete to reinforce the city walls, pulleys to throw stones, and continuous crossbow firing arrays to crush the strong attacks again and again. Qian Tong, a wealthy businessman in the city, conspired to dedicate the city, veteran Zhao Daniu secretly contacted the old army, and young craftsman Lu Yan dedicated the lost diagram of the lost divine machine crossbow. Shen Yue not only has to fight against foreign enemies, but also to eliminate internal ghosts and unite the morale of the army. When the rebels used the Fire Bull Formation and tunnel digging, Shen Yue and Zhou Jin teamed up to set up a series of plans to counterattack in one fell swoop. Defending Yong'an is just the beginning, a bigger conspiracy and territory are waiting outside the city.
