Any good anagrams for gorge of a bastion?

In fortification, is usually an open space between the extremities of the flanks of the bastion. The larger this gorge is, the better is the defense; for when the ruined bastion is about to fall by siege into the hands of the enemy, the defenders can construct defensive works or dig small ditches in the gorge of the abandoned bastion. Such resistance sometimes drives the besiegers to the necessity of battering in breach the curtain.

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