In the late spring of 1940 the forces of five nations for the first time - and hopefully the last - fought for the control of Northern Norway. In this study , also for the first time, historians from those five countries join forces to review and analyse tha campaign and its background. In spite of the Narvik Campaign having been termed "the most completely researched campaign" of the Second World War", this multinational approach yields a wealth of new insights. Of particular interest is the focus on failures of command, of inteligence, and of equipment and training for winter warfare.