noun, noun or participle which takes 'suru', intransitive verb
surrender of a castle; capitulation of a fortress
Historical term for the formal surrender of a castle or stronghold, often used in accounts of sieges and warfare. Can also be used figuratively for giving up a defended position.
城主はついに開城を決意した。
The lord of the castle finally decided to surrender the castle.
包囲軍の前に城は開城
The castle surrendered to the besieging army.