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A bastion is a work projecting outward from the main enclosure of a fortification, consisting of two faces and two flanks, and so constructed that it is able to defend the adjacent curtain, or wall which extends from one bastion to another, with a flanking fire. Two adjacent bastions are connected by the curtain, which joins the flank of one with the adjacent flank of the other. The distance between the flanks of a bastion is called the gorge. A lunette is a detached bastion. There have been various forms of bastion through the ages:
A composed bastion is one in which the sides of the interior polygon are very irregular, with the effect of making the gorges also irregular.
A cut bastion is one which has a re-entering angle instead of a point.
A deformed bastion is one in which the irregularity of the lines and angles prevents the structure from having a regular form.
A demi-bastion is a bastion composed of one face only with a single flank and a demi-gorge.
A double bastion is a bastion raised on the plane of another.
A flat bastion is a bastion erected in the middle of a curtain when the latter is too long to be protected by the bastions at its ends.
A hollow bastion is a bastion hollow in the interior, that is between the flanks and the faces of the point.
A regular bastion is one so planned as to possess a true proportion of its faces, flanks and gorges.
A solid bastion is one solid throughout its entire structure.
 Research Bastion
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Abbreviations
Warfare
