noun, noun or participle which takes 'suru'
castle siege; siege warfare
Refers to the act of besieging a castle, often used in historical or military contexts. Can be used as a noun or with する to mean 'to lay siege to a castle'.
戦国時代には攻城戦が頻繁に行われた。
Castle sieges were frequently conducted during the Warring States period.
敵軍は城
The enemy army gathered a large force to lay siege to the castle.