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outwork
An outwork is a minor fortification built or established outside the principal fortification limits, detached or semidetached. Outworks such as ravelins, lunettes (demilunes), flèches and caponiers to shield bastions and fortification curtains from direct battery were developed in the 16th century. Later, the increasing scale of warfare and the greater resources available to the besieger accelerated this development, and systems of outworks grew increasingly elaborate and sprawling as a means of slowing the attacker's progress and making it more costly. When taken by an enemy force, their lack of rear-facing ramparts left them totally open to fire from the main works.〔(''A Dictionary of Military Architecture Fortification and Fieldworks from the Iron Age to the Eighteenth Century'' ) by Stephen Francis Wyley. Retrieved 23 May 2015.〕
==See also==
* List of established military terms
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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