He transmigrates to 1931, and the Japanese invaders are already entering the village from the start.
Other transmigrators get planes and tanks. Chen Zheng only receives an "Anti-Japanese War Supplies System": he has to build the guns himself, grow the food himself, train the soldiers himself, and treat the wounded himself.
Starting by defending a single village, he leads three hundred elderly and weak villagers through the White Mountains and Black Waters, slowly forging a force that makes the Japanese invaders tremble at the sound of its name.
This time, the land will not be lost.