Grytviken and Leith Harbour. Most of the British and Norwegian whaling factories and catchers were destroyed by German raiders, while the rest were called up to serve under Allied command. The resident British Magistrates (W. Barlas and A.I. Fleuret) attended to the island's defence throughout the War. The Royal Navy armed the merchant vessel Queen of Bermuda to patrol South Georgian and Antarctic waters, and deployed two four-inch (102 mm) guns at key locations protecting the approaches to Cumberland Bay and Stromness Bay, i.e. to Grytviken and Leith Harbour respectively. These batteries (still present) were manned by volunteers from among the Norwegian whalers who were trained for the purpose. Sovereignty dispute and Falklands War According to the Papal Bull Inter caetera, issued by Pope Alexander VI on 4 May 1493, the dividing line between the crowns of Spain and Portugal had found the longitude 36 º 8'O, cutting South Georgia (according to other sources in longitude 35 º W). But with the entry into force of the Treaty of Tordesillas in 1494, the island was in the Portuguese hemisphere. Regarding the South Sandwich Islands, both the bull and the Treaty were within the Portuguese hemisphere. The first official announcement of an Argentine claim of South Georgia was made in 1927 at the International Postal Bureau in Bern. The first definitive Argentine claim of sovereignty over the South Sandwich Islands was made in 1938, when the President of Argentina ratified the 1934 Cairo Postal Convention. Since then, Argentina has maintained her claims of South Georgia and the South Sandwich Islands but repeatedly (in 1947, 1951, 1953, 1954 and 1955) refused to have them resolved by the International Court of Justice or by an independent arbitral tribunal. The Argentine naval station Corbeta Uruguay was clandestinely built on Thule Island, in the South Sandwich Islands on 7 November 1976 and was subject to a number of official British protests, the first of them on 19 January 1977. Arrangements to legitimise the station were discussed in 1978 but failed. At an early stage of the Falklands Conflict, 32 special forces troops from Corbeta Uruguay were brought by the Argentine Navy ship Bahía Paraíso to South Georgia and landed at Leith Harbour on 25 March 1982. Joined by the corvette ARA Guerrico, on 3 April the Bahía Paraiso attacked the platoon of 22 Royal Marines deployed at Grytviken. The two-hour battle resulted in the Guerrico