Kammala jumla mai zuwa: An kafa shi a matsayin HMS "Phaeton", jirgin ya samu ta RAN, ya kaddamar da shi a matsayin HMAS "Sydney" kuma an umurce shi a 1935. Hakanan ya shiga cikin yakin basasa na Bahar Rum. "Sydney" ya nutsar da jirgin ruwa na Italiya "Bartolomeo Colleoni" a yakin Cape Spada a 1940. Daga baya a wannan shekarar, "Sydney" ya shiga cikin
Yaƙin Cape Matapan da Yaƙin Calabria, nutsar da masu hallaka Italiya biyu, da kuma. A cikin 1941, a Yammacin Ostiraliya, "Sydney" ya ci karo da jirgin ruwa na Jamus mai suna "Kormoran"; jiragen ruwa biyu sun hallaka juna kuma "Sydney" ya ɓace tare da dukkan hannayensu; an gano raƙuman jiragen ruwa biyu a shekara ta 2008.