Jisho

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国家要塞
Wikipedia definition
1. National redoubtA national redoubt is a general term for an area to which the (remnant) forces of a nation can be withdrawn if the main battle has been lost—or even beforehand if defeat is considered inevitable. Typically a region is chosen with a geography favouring defence, such as a mountainous area or a peninsula, in order to function as a final hold-out to preserve national independence for the duration of the conflict.
Read “National redoubt” on English Wikipedia
Read “アルプス国家要塞” on Japanese Wikipedia
Read “National redoubt” on DBpedia

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