After the earlier St. Martins Battery was superseded by the construction of the citadel battery in the late 20th century, it fell out of use, was disarmed in 1902 and remained, probably in care and maintenance, until 1940. At this time, it was brough back into service and extensively remodelled to take three 6-inch guns for coast defence, remaining operational until late in 1944. These alterations included the construction of three new guhouses and major alterations to the gun emplacements. (location accurate to the nearest 2m based on available information)