High Quality Content by WIKIPEDIA articles! USS DeKalb (ID-3010) was a German mail ship SS Prinz Eitel Friedrich (1904) that served during the early part of the First World War as an auxiliary cruiser (Hilfkreuzer) in the German Navy and later after the US entry into the war, as US Navy troop ship. Post war she returned to civilian service as the US transatlantic liner SS Mount Clay.