the use of the letter " do (or to 戸 )" implies that they were chinese continental style swinging doors rather than shitomi (a generic term for timber shutters or doors that generally have vertical and horizontal lattice attached to the exterior surface and sometimes to the interior surface as well ). 戸とあるから、蔀（しとみ）ではなく大陸様式の扉開き戸であったと考えられる。
the entrance path is mostly winding and earthen walls called shitomi (timber shutters or doors that generally have vertical and horizontal lattice attached to the exterior surface and sometimes to the interior surface as well ) or kazashi were built in front of the castle gate or with koguchi to prevent people from being able to enter straight into the castle . 大抵は曲げられて造られることが多く、城門や虎口の正面に蔀（しとみ）や芎（かざし）と呼ばれる土塁を設けてまっすぐ進めなくすることもある。
