German Passenger Liners Kronprinz Wilhelm and Prinz Eitel Friedrich (left) Interned at the Philadelphia Navy Yard, Pennsylvania, on 26 March 1917, shortly before they were seized by the United States. They are still flying the German flag, and German guns are visible on Prinz Eitel Friedrich's stern. During 1917-19, these ships respectively served as USS Von Steuben (ID # 3017) and USS De Kalb (ID # 3010). U.S. Naval History and Heritage Command Photograph.