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A glacis (; ) in military engineering is an artificial slope as part of a medieval castle or in early modern fortresses. They may be constructed of earth as a temporary structure or of stone in more permanent structure. A ''glacis plate'' is the sloped front-most section of the hull of a tank or other armored fighting vehicle. More generally, the term ''glacis'' can denote any slope, natural or artificial, which fulfils the above requirements. The etymology of this French word suggests a slope made dangerous with ice, hence the relationship with ''glacier''. ==Ancient fortifications== A glacis could also appear in ancient fortresses, such as the one built at Semna, by the ancient Egyptians. Here it was used by them to prevent enemy siege engines from weakening defensive walls. Ancient British hill forts started to incorporate glacis around 350 BC. Those at Maiden Castle in Dorset were high. 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「glacis」の詳細全文を読む スポンサード リンク
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