Star Wall: Era of Counter-War

The theme is that the captain of the cannon fodder team in the previous life was besieged to death while fighting against the demons from outside the territory. He went back to 30 years ago. There are still 30 years before the arrival of the demons in this life. He wants to lead the whole territory to become rich, develop technology, teach martial arts, simulate attacks with the demons, prepare to destroy the demons, and annihilate them in one fell swoop when the demons come!