Jiang Lin, a modern special forces instructor, accidentally plunged into an abyss during a training exercise. When he woke, he had become the illegitimate son of a fallen military family in the Northern Realm Dynasty. The dynasty was corrupt, the borderlands were ablaze with war, and the Jiang family, a household of loyal defenders, had been pushed aside by the powerful, leaving only the old, the weak, women, and children. Jiang Lin had hoped to live quietly, but was forced into the struggle for his family’s survival. Drawing on modern military theory and martial arts, he distinguished himself repeatedly on the frontier, gathered refugees, and trained a new army, fighting his way out of desperate straits. But his growing achievements made the throne wary, and undercurrents stirred in the court. He gradually discovered that his transmigration was no accident: this land from a thousand years ago was tied to his past life by an inescapable chain of cause and effect. The first volume follows his rise from nothing on the frontier, where he holds a lonely city against ten thousand with just a hundred men. The second follows him as he leads iron cavalry across the realm and reshapes the order of the world, only to face a final choice between retiring after victory and relieving the people’s suffering.