crownwork

{{Short description|Element of the trace italienne system of fortification}}

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A crownwork is an element of the trace italienne system of fortification and is effectively an expanded hornwork (a type of outwork). It consists of a full bastion with the walls on either side ending in half bastions from which longer flank walls run back towards the main fortress.{{sfn|Griffiths|1862|p=[https://books.google.com/books?id=hUJKAAAAYAAJ&pg=PA262 262]}}

The crownwork was used to extend the fortified area in a particular direction, often in order to defend a bridge, prevent the enemy occupying an area of high ground, or simply strengthen the overall fortifications in the expected direction of attack.{{sfn|Editor|1830|p=[https://books.google.com/books?id=nUvzAAAAMAAJ&pg=PA590 590]}}