Consequently, although it was one of the largest castles in Japan, it is said that it did not have simple Koguchi (castle entrances) or Tatebori (moats parallel to mountain slopes), and there were not enough defense facilities, because the castle was built for politics and to show their power rather than to defend against the attacks of enemies.
このため規模こそ日本国内で屈指のものであるが、防備のための城というよりも、権威づけ、政治色の強い城ではあったため、単純な虎口、竪堀などはなく防御施設は貧弱と言われている。