Commander of the 388th Infantry-Regiment (26 Aug 1939-25 Sep 1941). In this posting Daser took part in Operation Weserübung (the German invasion of Norway and Denmark in March 1940) as part of the 214th Infantry Division, which afterward was part of the German forces occupying Norway. But after the 1941 reorganisation in which the 388th regiment was detached to the Russian front, he received a temporary posting at the Replacement Army, where he would periodically reappear.