The Swedish volunteers remain a source of dissonance between Swedes and Finns. The domestic debate in Finland had in the years immediately before the war given common Finns hope of considerably more support from Sweden, such as a large force of regular troops, that could have had a significant impact on the outcome of the war—or possibly caused the Soviets not to attack at all. However, the help from volunteers, especially the Scandinavian ones, was appreciated by the Finns. This is shown by the fact that during the Norwegian Campaign against the German invasion in April 1940, a Finnish group of volunteers formed an ambulance unit and helped the defenders until forced to return home because of the success of the German armed forces. A group of Swedish and Finnish volunteers also fought alongside Norwegian soldiers against the German invaders near Os, on 2 May as well.