Hornwork
Feature 'f' is a hornwork. From Cyclopaedia.
hornwork
The Weber Church of Zittau inside a hornwork (Europaeum Theatrum, Volume 5, Plate 12. Published in 1651 in Frankfurt am Main).
A hornwork is an element of the Italian Bastion system of fortification. Its face is flanked with a pair of demi-bastions.
Distinguish from a crownwork, which contains a full bastion at the center.
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