Fort Gleppington was constructed by halflings and gnomish architects during the 3rd Age to aid in liberating the island from the Dwarvic Conglomerate. It was not made to last, with much of its design relying on tricks, contraptions, and clever technology. For example, one of the turrets was mounted with a lensed contraption capable of concentrating sunbeams and aiming them precisely to blind blockading ship crew, prematurely light cannon fuses, and in some cases even set ships on fire. However, eventually the fortress succumbed to sheer numbers as an invading fleet bombarded it from all sides, leveling the structure to the ground and leaving no survivors.
There is a misprint in the Blimnor World Map which lists the location as "Gloppington Fort".