Jisho

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ほうめんぐん 方面軍
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Noun
1. area army (of the Imperial Japanese Army); field army​Military, Historical term
Wikipedia definition
2. Field army​A field army or numbered army, usually referred to simply as an Army, is a military formation in many national military forces, superior to a corps and beneath an army group. Likewise, air armies are equivalent formation within some air forces. Particular field armies are usually named or numbered to distinguish them from "army" in the sense of an entire national land force.
Read “Field army” on English Wikipedia
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Read “Field army” on DBpedia

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