Hornwork
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A hornwork is an element of the Italian bastion system of fortification. Its face is flanked with a pair of half-bastions. It is distinguished from a crownwork, because crownworks contain full bastion
Feature 'f' is a hornwork
Drawing, showing a hornwork, of the fortress Nya Älvsborg in Gothenburg, Sweden from 1811.
Outwork
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An outwork is a minor fortification built or established outside the principal fortification limits, detached or semidetached. Outworks such as ravelins, lunettes, flèches and caponiers to shield bast
View of the fortifications of Valletta, with the main fortification (a bastion) to the left, the ditch in the centre, and the outwork (a counterguard) to the right