A superb map of the harbor of Mahon, the largest deep-water harbor in the Mediterranean Sea, on the Balearic Island of Minorca (today’s Spain).  Specifically, this map illustrates the siege of Fort St. Philip strategically located at the entrance to the harbor in 1756 during the Seven Years' War.  A French force landed on the island and besieged the British garrison at Fort St. Philip, forcing them to surrender after a long siege.  The subsequent attempt by the British naval relief force to save the island was unsuccessful.  Great deal of detail of military positions and topography is shown on the map.