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HMAS Adelaide was a Town-class light cruiser of the Royal Australian Navy (RAN), named after Adelaide, the capital city of South Australia. Laid down in 1915, wartime shortages and design modifications meant the ship was not completed until 1922, earning her the nickname "HMAS Longdelayed".

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HMAS Brisbane was a Town class light cruiser of the Royal Australian Navy (RAN). Built in Sydney between 1913 and 1916 to the Chatham subtype design, Brisbane operated in the Indian Ocean, Pacific Ocean, and Australian coastal waters during World War I.

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HMAS Encounter was a second-class protected cruiser of the Challenger class operated by the Royal Navy (RN) and Royal Australian Navy (RAN). She was built by HM Dockyard Devonport and completed at the end of 1905.

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HMAS Melbourne was a Town class light cruiser operated by the Royal Australian Navy (RAN). The ship was laid down by Cammell Laird at Birkenhead in England in 1911, launched in 1912 and commissioned in 1913. At the start of World War I, Melbourne was involved in attempts to locate the German East Asia Squadron, and participated in the capture of German colonies in the Pacific, before being assigned to the North America and West Indies Stations. In 1916, the cruiser joined the Grand Fleet in the North Sea, where she remained for the remainder of the war. Melbourne spent late 1919 and early 1920 in reserve, then was flagship of the Royal Australian Navy from 1920 until 1928, except for a second period in reserve during 1924 and 1925. HMAS Melbourne paid off in the United Kingdom on 23 April 1928, and was scrapped in 1929.

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HMAS Pioneer was a Pelorus-class protected cruiser built for the Royal Navy at the end of the 19th century. She was transferred to the fledgling Royal Australian Navy (RAN) in 1912. During World War I, the cruiser captured two German merchant ships, and was involved in the East African Campaign, including the blockade of the cruiser SMS Königsberg and a bombardment of Dar-es-Salaam. She returned to Australia in late 1916 and was decommissioned. Pioneer was used as an accommodation ship for the following six years, then was stripped down and sold off by 1926. The cruiser was scuttled outside Sydney Heads in 1931.

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HMAS Psyche was a Pelorus-class protected cruiser built for the Royal Navy at the end of the 19th century. Initially operating on the North America and West Indies Station, the cruiser was transferred to the Australian Squadron in 1903, and remained there until the Royal Australian Navy (RAN) took over responsibility in 1913. After a stint in New Zealand waters and involvement in the Occupation of German Samoa, Psyche was paid off in 1915.

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HMAS Sydney was a Chatham-class light cruiser of the Royal Australian Navy (RAN). Laid down in 1911 and launched in 1912, the cruiser was commissioned into the RAN in 1913.