Bell battery is one of two substantial gun batteries constructed in the 18th century within the middle bailey to cover the high ground located on the northern side of the castle (the other is four gun battery). It was originally constructed in 1756 replacing a length of Medieval curtain wall and had six gun emplacements. This was reduced to five in 1820 and the current layout of four with a brick side arms store were likely part of the 1850’s remodelling. (location accurate to the nearest 1m based on available information)