In the art of war, it is not enough to have superiority in numbers, or strength in arms. True victory, lasting victory, is a cultural thing. To stop a conflict, you must not only defeat armies, you must defeat the will to fight. You must appease your enemy, convince them they have won, or eradicate them utterly. A nation with an expansive population, therefore, benefits from extermination. With a surplus of peasants, a newly cleared land can be rapidly repopulated, and, with an Infrastructure of buildings already in place, made productive in short order. In the reign of Emperor Yuan XI this was demonstrated most admirable in the marshlands to the south.