According to the “circle of justice”, why was it important for military commanders to keep the interests of the peasantry in mind?

According to the Circle of Justice, it was important for the military commanders to keep the interests of the peasants in mind because a king can’t survive without his soldiers and soldiers need motivation to work for the king so as a reward for their services king have to give them salary which came from the revenue collected from the peasants and peasants could pay the revenue only when they were prosperous and happy.