In permanent fortifications and enclosed field
fortifications (such as star forts, bastion forts, and redoubts) the gorge
was taken as either the front of fortification that contained the main entrance
or sally port of the fortification or the rear of an outwork commanded by
another outwork or the enceinte. The gorge of a bastion and other salient
trace in a continuous line of rampart was taken as a line produced from the
interior extremity of one flank to the other. In unenclosed field fortifications
such as continuous lines of works, lunettes, and redans, the gorge was considered
to be the rear of the fortification or a front of fortification that was
not shielded by a continuous parapet.
A demi-gorge was understood as one-half the gorge of a unenclosed field work
or salient element in the trace of a permanent fortification. The division
of a gorge into two demi-gorges was usually determined by the point of
intersection of the gorge with either an oblique or right radius of the polygon
of fortification. |