(Mircea was also built in 1937 for the Romanian Navy, and work began on a fifth ship called Herbert Norkus, but was stopped with the outbreak of war.) Horst Wessel was commanded by Captain August Thiele, a previous Captain of Gorch Fock, and it was homeported in Kiel. In the three years before World War II, she undertook numerous training cruises in the North Atlantic waters, sailing with trainee groups consisting of both future officers and future petty officers.