Transmigrating into a family of legendary generals, I build the "strongest imaginary enemy" for my country. The hegemon invades, only to discover that even its troops can't beat my army's "human-versus-machine mode"!
When transmigrator Lin Feng opens his eyes, he discovers that he has become the grandson of one of Xia Country's founding generals, but also a descendant of a military family who rejects his fate and chooses to lie flat. Faced with a country so much like the one he once called home, with a weakened military and powerful enemies on every side, all he has is an old service medal left by his grandfather and a vision of a steel torrent far ahead of its time.
He could have lived a comfortable life, but the blizzards at the border and the sacrifices etched into his memories eventually push him back onto the path of the generation before him. Starting with the toughest border defense company, he uses "scientific" training to crush the tradition of "toughing it out," and turns the rules of military exercises upside down with his "Ghost" squad. When the entire army is being tormented by the "Blue Army" he has forged, the real opponent arrives: the world's hegemon, Eagle Country, leading a mighty coalition force.
But waiting for them is an iron army, tempered for ten years by the "strongest enemy force in history." The stealth fighters, invincible fleet, and elite marines Eagle Country prides itself on are riddled with flaws in the eyes of Xia Country's soldiers. "Their flanking maneuvers aren't as good as our Blue Army's raw recruits." "Is this really the level of their tactics? Did the instructors overestimate them?"
This is an overwhelming victory across the divide of eras. When Eagle Country's five-star general asks in a trembling voice, "Who are you people?" the soldiers of the entire army answer, their voices ringing through the skies: "We're the troops trained by Ghost!"
So far, the writing is decent; the rest depends on how well the later plot develops.