Törni was not happy when Finland made peace with the Soviets. The peace agreement required Finland to take up arms against Germany in the Lapland War. He left the Finnish Army. In 1945, he was recruited by a pro-German resistance movement in Finland. He traveled to Germany for saboteur training. He wanted to organize resistance in case Finland was occupied by the Soviet Union. He surrendered to British troops in Germany at the end of World War II. Then he returned to Finland in June 1945.