noun, noun or participle which takes 'suru'
fortification; fortifying
Refers to the act or process of strengthening a place against attack, or the resulting fortified state. Often used in military, historical, or strategic contexts.
国境の町を要塞化する計画が進んでいる。
Plans are underway to fortify the border town.
この城は
This castle was fortified during the Warring States period.