The Bomb Proof Gallery was probably built around the time of the Great Siege and provides flanking fire along the front of Grand Battery. The Gallery has two gun casemated embrasures and a small magazine to the rear. It is part of the Lower Galleries and is accessed through the King’s Gallery.
Returns show that the battery mounted the following guns:
- Two 24-lbs
- Two 12-ins Smooth Bore Bronze guns.
Described as being on the Kings Lines, this battery provides access to the Kings Lines Battery and Hanover Gallery. The area has recently been cleared of rubbish.