The north Lines battery which is located on to the west of the Drop Redoubt was constructed in 1893. It was not a battery in its own right but rather, formed part of the Drop Redoubt defences, occupying the ridge between the Drop Redoubt and the North Entrance and commanding the valley to the north. The ridge west of the Drop Redoubt is flattened into a broad top, along the north side of which four gun emplacements stood on a terreplein behind a rampart. The terreplien is located on the north-western side of the fort while the rampart is located on the North-West, North-Eastern and South-Eastern sides of the fort. (location accurate to the nearest 1m based on available information)