If enemies attacked the castle from the south where the Rakuichi and the residences of the Rokkaku clan were located, the Hiraimaru (Kuruwa) and Ikedamaru (Kuruwa) areas were there with strong stone walls to block them; and if enemies tried to send troops to the flatland at the skirt of the mountain, there was a possibility of a pincer drive by the armies from Mitsukuri-jo Castle and Chokoji-jo Castle, the subsidiary castles of Kannonji-jo Castle.
南側、つまり楽市や六角氏の居館があった方向から攻め上ろうとすると、そこには強固な石垣がある平井丸、池田丸があり、また山裾の平地部分に部隊を展開しようとすると、観音寺城の支城、箕作城、長光寺城があり挟撃される可能性がある。