The Battle of Pinghai has collapsed across the entire front. Japanese invaders trample Huayan's rivers and mountains, burning, killing, and looting wherever they go, leaving corpses strewn across the land.
Lu Zheng, a defeated soldier, watches his countrymen die and his homeland fall. Driven to the brink, he kills two Japanese invaders in a fit of rage and swears a blood oath: He will not rest until every foreign invader is expelled and the nation reclaimed! As the oath is made, the [Behind-the-Lines Arms Production and Tactical Assistance System] unexpectedly activates.
While others fight desperately with too few guns and bullets, he uses the System to unlock military technology. He reloads bullets with rudimentary methods, mass-produces mortars, and improves minefields, turning a workshop in a ruined temple deep in the mountains into the strongest arms factory behind enemy lines! While others are driven back step by step under Japanese offensives, he leads his men in ambushes, captures blockhouses, blows up railways, and retakes county seats. He wipes out elite Japanese units and strikes such fear into the collaborationist troops that they tremble at his name. From a lone defeated soldier, he grows into an iron-blooded war god who holds the line for an entire region.
With the land in ruins, every citizen has a duty to fight. He will make a Great Wall of his own flesh and blood and wield guns and cannons as his blades. Fighting to the death behind enemy lines, he will protect our vast homeland and restore our nation's glory!
