noun, noun or participle which takes 'suru', intransitive verb
bloodless surrender of a castle; capitulation without resistance
Historical term for surrendering a castle or stronghold without bloodshed, often used in the context of the Meiji Restoration (e.g., the surrender of Edo Castle).
江戸城の無血開城は、明治維新の重要な出来事だった。
The bloodless surrender of Edo Castle was an important event of the Meiji Restoration.
交渉の結果、城は無血開城された。
As a result of negotiations, the castle was surrendered without bloodshed.