(4 – 6 May 1943) Rhein (7 – 10 May 1943) Elbe 2 (10 – 14 May 1943) Summary of raiding history See also List of successful U-boats References Notes Citations Bibliography External links uboataces.com webpage with insignia for U-103 German Type IX submarines U-boats commissioned in 1940 U-boats sunk in 1945 World War II submarines of Germany World War II shipwrecks in the Baltic Sea 1940 ships Ships built in Bremen (state) U-boats sunk by Canadian aircraft Maritime incidents in April 1945