The World Belongs to the Strong: A General's Campaigns

A special police officer sacrifices himself to save a comrade and transmigrates to ancient times, where he becomes a great general tasked with protecting the nation. He leads troops into battle to defend his homeland, conquers cities and territory, and builds his own empire! Using modern knowledge, he creates a business empire of his own. By chance, he also learns peerless martial arts and makes a name for himself in the martial world!