A hornwork is an element of the trace italienne system of fortification. It consists of a pair of demi-bastions with a curtain wall connecting them and with two long sides directed upon the faces of the bastions, or ravelins of the inner fortifications, so as to be defended by them.{sfn|Griffiths|1862|p=262} The hornwork was used to extend the for...
cuckoldry
• (n.) An outwork composed of two demibastions joined by a curtain. It is connected with the works in rear by long wings.
outer earthwork obstacle usually set before an entrance to inpede attackers
Freestanding quadrilateral fortification in front of the main wall.
Freestanding quadrilateral fortification in front of the main wall.
'Horned' structure, consisting of two demibastions, one at each end of a curtain.
Horn'work` noun (Fort.) An outwork composed of two demibastions joined by a curtain. It is connected with the works in rear by long wings. 
In fortification, a hornwork was a form of advanced work consisting of two half-bastions and a curtain, with two long sides called wings, which were flanked by the main works in the rear. Hornworks were extended defensible positions used to occupy advantageous ground or to command ground otherwise unseen.