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Defense line : ウィキペディア英語版 | Defense line
Defense line or fortification line is a geographically-recognizable line of troops and armament, fortified and set up to protect a high-value location during an armed conflict. Such a line may be based on natural terrain features related to difficult terrain, such as rivers or marshes; temporary field fortification such as trenches; and more permanent fortifications such as fortresses. World-famous fortification lines include Maginot Line in France.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Defense line」の詳細全文を読む
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