HMAS Australia (I84/D84/C01) was a County-class heavy cruiser of the Royal Australian Navy (RAN). One of two Kent-subclass ships ordered for the RAN in 1924, Australia was laid down in Scotland in 1925, and entered service in 1928. Apart from an exchange deployment to the Mediterranean from 1934 to 1936, during which she became involved in the planned British response to the Abyssinia Crisis, Australia operated in local and South-West Pacific waters until World War II began.
The cruiser remained near Australia until mid-1940, when she was deployed for duties in the eastern Atlantic, including hunts for German ships and participation in Operation Menace. During 1941, Australia operated in home and Indian Ocean waters, but was reassigned as flagship of the ANZAC Squadron in early 1942. As part of this force (which was later redesignated Task Force 44, then Task Force 74), Australia operated in support of United States naval and amphibious operations throughout South-East Asia until the start of 1945, including involvement in the battles at the Coral Sea and Savo Island, the amphibious landings at Guadalcanal and Leyte Gulf, and numerous actions during the New Guinea campaign. She was forced to withdraw following a series of kamikaze attacks during the invasion of Lingayen Gulf. The prioritisation of shipyard work in Australia for British Pacific Fleet vessels saw the Australian cruiser sail to England for repairs, where she was at the end of the war.
During the late 1940s, Australia served with the British Commonwealth Occupation Force in Japan, and participated in several port visits to other nations, before being retasked as a training ship in 1950. The cruiser was decommissioned in 1954, and sold for scrapping in 1955.
Australia was one of seven warships built to the Kent design of County-class heavy cruiser, which were based on design work by Eustace Tennyson-d'Eyncourt. She was designed with a standard displacement of 10,000 tons, a length between perpendiculars of 590 feet (180 m), a length overall of 630 feet 4 inches (192.13 m), a beam of 68 feet 3 inches (20.80 m), and a maximum draught of 21 feet 4 inches (6.50 m).
The propulsion machinery consisted of eight Yarrow superheated boilers feeding Curtis high-pressure and Parsons low-pressure geared turbines. This delivered up to 80,000 shaft horsepower to the cruiser's four three-bladed propellers. The cruiser's top speed was 31 knots (57 km/h; 36 mph), with a range of 2,270 nautical miles (4,200 km; 2,610 mi), while her economical range and cruising speed was 10,000 nautical miles (19,000 km; 12,000 mi) at 11 knots (20 km/h; 13 mph).
The ship's company consisted of 64 officers and 678 sailors in 1930; this dropped to 45 officers and 654 sailors from 1937 to 1941. While operating as flagship, Australia's company was 710. During wartime, the ship's company increased to 815.
Australia was designed with eight 8-inch (200 mm) guns in four twin turrets ('A' and 'B' forward, 'X' and 'Y' aft) as primary armament, with 150 shells per gun. Secondary armament consisted of four 4-inch (100 mm) guns in four single mounts, with 200 shells per gun, and four 2-pounder pom-poms for anti-aircraft defence, with 1,000 rounds each. A mixture of .303-inch machine guns (7.7 mm) were carried for close defence work: initially this consisted of four Vickers machine guns and twelve Lewis machine guns, although four Lewis guns were later removed. Two sets of quadruple 21-inch (530 mm) torpedo tubes were fitted. Four 3-pounder quick-firing Hotchkiss guns were used as saluting guns. During her 1939 modernisation, the four single 4-inch (100 mm) guns were replaced by four twin Mark XVI guns. The torpedo tubes were removed in 1942, and the 'X' turret was taken off in 1945.
The close-range anti-aircraft armament of the ship fluctuated during her career. During the mid-1930s, two quadruple 0.5-inch (13 mm) machine gun mounts were installed to supplement the 0.303-inch (7.7 mm) weapons. These were replaced in late 1943 by seven single 20mm Oerlikons. By early 1944, all seven Oerlikons had been upgraded to double mountings. These were in turn replaced by eight single 40 mm Bofors guns in 1945.
Australia was designed to carry a single amphibious aircraft: a Supermarine Seagull III aircraft, which was replaced in 1936 by a Supermarine Walrus. Both aircraft were operated by the Royal Australian Air Force's Fleet Co-operation Unit; initially by No. 101 Flight RAAF, which was expanded in 1936 to form No. 5 Squadron RAAF, then renumbered in 1939 to No. 9 Squadron RAAF. As the aircraft catapult was not installed until September 1935, the Seagull was initially lowered into the water by the ship's recovery crane to launch under its own power. The catapult and Walrus were removed in October 1944.
Armour aboard Australia was initially limited to an armour deck over the machinery spaces and magazines, ranging from 1.5 to 3 inches (38 to 76 mm) in thickness. Armour plate was also fitted to the turrets (up to 2 inches (51 mm) thick) and the conning tower (3 inches (76 mm) thick). Anti-torpedo bulges were also fitted. During 1938 and 1939, belt armour up to 4.5 inches (110 mm) thick was fitted along the waterline to provide additional protection to the propulsion machinery.
Australia was ordered in 1924 as part of a five-year plan to develop the RAN. She was laid down by John Brown & Company at its shipyard in Clydebank, Scotland, on 26 August 1925. The cruiser was launched on 17 March 1927 by Dame Mary Cook, wife of Sir Joseph Cook, the Australian High Commissioner to the United Kingdom and former Australian Prime Minister.
The cruiser was initially fitted with short exhaust funnels, but during sea trials of Australia and other Kent-class ships, it was found that smoke from the boilers was affecting the bridge and aft control position. The funnel design was subsequently lengthened by 15 feet (4.6 m); the taller funnels on the under-construction HMAS Canberra were later switched over to Australia as she neared completion.
When the ship's badge came up for consideration on 26 December 1926, both Richard Lane-Poole, commander of the Australian Squadron, and William Napier, First Naval Member of the Australian Commonwealth Naval Board disapproved of the design previously carried by the battlecruiser Australia, and requested new designs. On 26 July 1927, it was decided to use the Coat of arms of Australia as the basis for the badge, with the shield bearing the symbols of the six states and the Federation Star crest depicted in the design. No motto was given to the ship, but when the badge design was updated prior to the planned 1983 acquisition of the British aircraft carrier HMS Invincible (which was to be renamed HMAS Australia), the motto from the battlecruiser, "Endeavour", was added.
The warship was commissioned into the RAN on 24 April 1928. Construction of Australia cost 1.9 million pounds, very close to the estimated cost. Australia and sister ship HMAS Canberra (also constructed by John Brown) were the only County-class vessels built in Scotland.
Australia left Portsmouth for her namesake country on 3 August 1928 after completing sea trials. During the voyage, the cruiser visited Canada, the United States of America, several Pacific islands, and New Zealand before she reached Sydney on 23 October. Following the start of the Great Depression, the RAN fleet was downscaled in 1930 to three active ships (Australia, Canberra, and seaplane carrier Albatross) while one of the S-class destroyers would remain active at a time, with a reduced ship's company. In 1932, Australia cruised to the Pacific islands. In 1933, she visited New Zealand.
On 10 December 1934, Australia was sent to the United Kingdom on exchange duty, with the Duke of Gloucester, who had visited Victoria for the state's centenary of foundation the month previous, aboard. The cruiser reached Portsmouth on 28 March 1935, and was assigned to the Mediterranean Fleet. Australia returned to England from 21 June to 12 September to represent Australia at King George V's Silver Jubilee Naval Review at Spithead. Following the outbreak of the Abyssinian crisis, Australia began to train for a potential war. Australia's initial role in any British assault on the Italian Navy was to cover the withdrawal of the aircraft carrier HMS Glorious after an air attack on the base at Taranto. The crisis eased before the need for British involvement occurred. Australia remained in the Mediterranean until 14 July 1936, then visited Gallipoli in company with the new light cruiser HMAS Sydney, before the two ships sailed for Australia. They arrived in Sydney on 11 August. During the cruiser's time on exchange, the British cruiser HMS Sussex operated with the RAN.