Derfflinger ya kasance wani ɓangare na I Scouting Group don mafi yawan yakin duniya na, kuma ya shiga cikin ayyukan jiragen ruwa da dama a lokacin yakin. Ta shiga cikin hare-haren biranen bakin teku na Ingila, da kuma yakin Dogger Bank da Jutland, inda ta yi tsayayya da juriya ta sa Birtaniya ta kira ta "Iron Dog".
Karfe Kare