I Started with the Imperial Guard, but Ended up Changing the Plot?

He knew the war was going to be lost. He read this war from beginning to end in the archives: the empire must be defeated, the capital must be destroyed, and famous generals must die. There are still six years left until the end. It was enough for him to turn an inspector into the youngest commander-in-chief of the empire. Operation Iron Sickle, the first battle he won; the Siege of Viera, the second battle he defended; and the Battle of the Atlantic, the third battle he returned alive. The enemy thought he was a madman, and his own people thought he was a pawn. None of them knew that what this man was doing was called rewriting the destiny of the country.