Bastion
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A bastion is a structure projecting outward from the curtain wall of a fortification, most commonly angular in shape and positioned at the corners of the fort. The fully developed bastion consists of
Drawing of a bastion
One of the semi-circular bastions at Deal Castle, a Device Fort on the south coast of England
Aerial photograph of Neuf-Brisach, a fortress in use during the Napoleonic Wars
A bastion in the Komárno Fortress (Slovakia).
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.