The Norwegian mine layer Olav Tryggvason was taken over by German troops on 09.04.1940 in Horten, Norway. Two days later, it was commissioned as mine layer Albatros , on 16.05 it was renamed to Brummer (II). The ship first operated off the Dutch/Beligan coast and was planned to be used during Operation Seelöwe, the invasion of England. At the beginning of the war against Russia, the ship was sent to the Baltic Sea and stayed there until 1942. Between 1942 and 1944, it was mainly used in the North Sea and at the Norwegian coast. In 1944/45 the Brummer operated in the Baltic Sea again, for mine laying operation and later to transport refugees back to Germany. While being docked at the Deutsche Werke shipyard in Kiel, it was badly damaged during an air attack on 03.04.1945. The wreck was scrapped between 1945 and 1948.