Kammala kalmar mai zuwa: "Antrim", wanda aka kira shi don tunawa da gundumar Irish, John Brown & Company ne ya kafa shi a tashar jirgin ruwa ta Clydeside a ranar 27 ga Agusta 1902 kuma an kaddamar da shi a ranar 8 ga Oktoba 1903. An kammala shi a ranar 23 ga Yuni 1905 kuma an fara sanya shi zuwa Squadron 1st Cruiser na Channel Fleet tare da yawancin 'yan uwanta mata. An aika da ita zuwa Casablanca, Morocco Agusta 1907 bayan tashin hankali wanda ya haifar da
harin da aka kai Casablanca. An canja shi zuwa 2nd Cruiser Squadron na Atlantic Fleet a watan Maris na 1907 sannan aka sanya shi zuwa ajiya na Uku na Uku a Devonport a watan Afrilu na 1909. An tura ta zuwa Mersey a lokacin yajin aikin jigilar kayayyaki na Liverpool na shekarar 1911. A watan Disamba na 1912 jirgin ya zama babban jirgin ruwa na 3rd Cruiser Squadron na Rundunar Soji ta Biyu.