Why does the Emperor want war?
Is it for the achievement of expanding territory?
On the one hand, only through occupying more and larger lands can one have enough arable land, rivers, and grassland resources to ensure the supply of food, and thereby support a huge government organization and army. With an adequate food supply, the empire's long-term stability and peace can be maintained. As the territory expands, the richer the grain and population resources become, the more robust the economic foundation, and the stronger the national strength, ensuring more room to maneuver when facing foreign invasions.
In the southward conquests and northern battles, storming cities and capturing camps not only allowed for expansion of territory but also were a crucial means for a monarch to display their prestige. Every historically notable sage monarch established their prestige by conquering vast territories for their subjects.