However, when Masanaga was appointed as shugo of Yamashiro Province during the war, he forced through an implementation of Shugo-ryogoku system in order to obtain the real power of shugo, which was just a nominal role before because originally Yamashiro Province was governed as direct control territory of the bakufu or Imperial Court, or as shoen (manor) of dominant nobility or temples and shrines.
ところが、乱の最中に政長が山城国の守護に任じられると、本来山城国は幕府や朝廷の直轄領や有力貴族・寺社の荘園として統治され、名目上の役割に過ぎなかった筈の守護職に実権を得るために、守護領国制の導入を強行した。