Through distinguishing themselves as local governors or oryoshi, establishing themselves in the areas they were transferred to, and being officially permitted by kokuga to manage koden (field administered directly by a ruler), they established enough of an economic foundation to maintain their own military power.
彼らは国司や押領使として勲功を挙げるとともに、赴任した地方に土着して国衙から公田経営を公認されるなど、自らの軍事力を維持出来るだけの経済基盤を築いた。