A Nazi propaganda film showing dramatic footage of a Second World War battle against British forces has been found. Kampf um Norwegen - or "the Struggle for Norway" - is a rare 80-minute documentary commissioned by the high command of the German army in 1940. It displays ordinary German soldiers as super-heroes as they conquered the country. It is believed the film was dubbed into English to be screened in the then neutral US and distributed in Portugal, Spain and parts of Africa. Associate Professor Jostein Saakvitne, at Bergen University College, found the film on sale in an internet auction. Ragnar Løvberg, an archivist at the Norwegian Film Institute, said: "The film contains a range of scenes that have never been made public before. A great deal of it is devoted to the Battle of Narvik against British forces." Prof Saakvitne added: "We don't know where the film came from, but there is every reason to believe it had lain forgotten in a loft or cellar." Narvik was a key port for Swedish ore mines. During the battle, more than 1,000 men and three German destroyers were sunk by the Royal Navy and five were scuttled by their crews.