the 1920s, Norway renamed the archipelago Svalbard, and the main island became Spitsbergen. Kvitøya, Kong Karls Land, Hopen, and Bjørnøya were not regarded as part of the Spitsbergen archipelago. Russians have traditionally called the archipelago Grumant (). The Soviet Union retained the name Spitsbergen () to support undocumented claims that Russians were the first to discover the island. In 1928, Italian explorer Umberto Nobile and the crew of the airship Italia crashed on the icepack off the coast of Foyn Island. The subsequent rescue attempts were covered extensively in the press and Svalbard received short-lived fame as a result. Second World War Svalbard, known to both British and Germans as Spitsbergen, was little affected by the German invasion of Norway in April 1940. The settlements continued to operate as before, mining coal and monitoring the weather. In July 1941, following the German invasion of the Soviet Union, the Royal Navy reconnoitered the islands with a view to using them as a base of operations to send supplies to north Russia, but the idea was rejected as impractical. Instead, with the agreement of the Soviets and the Norwegian government in exile, in August 1941 the Norwegian and Soviet settlements on Svalbard were evacuated, and facilities there destroyed, in Operation Gauntlet. However the Norwegian government in exile decided it would be important politically to establish a garrison in the islands, which was done in May 1942 during Operation Fritham. Meanwhile, the Germans responded to the destruction of the weather station by establishing a reporting station of their own, codenamed "Banso", in October 1941. This was chased away in November by a visit from four British warships, but later returned. A second station, "Knospel", was established at Ny-Ålesund in 1941, remaining until 1942. In May 1942, after the arrival of the Fritham force, the German unit at Banso was evacuated. In September 1943 in Operation Zitronella a German task force, which included the battleship Tirpitz, was sent to attack the garrison and destroy the settlements at Longyearbyen and Barentsburg. This was achieved, but had little long-term effect: after their departure the Norwegians returned and re-established their presence. In September 1944, the Germans set up their last weather station, Operation Haudegen in NordOstLand; it functioned until after the German surrender. On 4 September 1945, the soldiers were picked up by a Norwegian seal hunting vessel and surrendered to its captain. This group of men