HMAS Wallaroo

In 1938, the Australian Commonwealth Naval Board (ACNB) identified the need for a general purpose 'local defence vessel' capable of both anti-submarine and mine-warfare duties, while easy to construct and operate.[3][4] The vessel was initially envisaged as having a displacement of approximately 500 tons, a speed of at least 10 knots (19 km/h; 12 mph), and a range of 2,000 nautical miles (3,700 km; 2,300 mi)[5] The opportunity to build a prototype in the place of a cancelled Bar-class boom defence vessel saw the proposed design increased to a 680-ton vessel, with a 15.5 knots (28.7 km/h; 17.8 mph) top speed, and a range of 2,850 nautical miles (5,280 km; 3,280 mi), armed with a 4-inch gun, equipped with asdic, and able to fitted with either depth charges or minesweeping equipment depending on the planned operations: although closer in size to a sloop than a local defence vessel, the resulting increased capabilities were accepted due to advantages over British-designed mine warfare and anti-submarine vessels.[3][6] Construction of the prototype HMAS Kangaroo did not go ahead, but the plans were retained.[7] The need for locally built 'all-rounder' vessels at the start of World War II saw the "Australian Minesweepers" (designated as such to hide their anti-submarine capability, but popularly referred to as "corvettes") approved in September 1939, with 60 constructed during the course of the war: 36 (including Wallaroo) ordered by the RAN, 20 ordered by the British Admiralty but manned and commissioned as RAN vessels, and 4 for the Royal Indian Navy.[3][8][9][10][1]

Wallaroo was laid down by Poole & Steel in Sydney on 24 April 1941.[1] She was launched on 18 February 1942 by Mrs Poole, wife of the shipyard's Chairman of Directors, and commissioned on 15 July 1942.[1]

Wallaroo entered service in September 1942, patrolling between Adelaide in South Australia and Fremantle in Western Australia for submarines, as well as performing escort and minesweeping duties around Fremantle.[1]

Just after midnight on 11 June 1943, while out to sea west of Fremantle, the corvette collided with United States Liberty Ship Henry Gilbert Costin.[1] The night was overcast, and the ships were travelling without lights as a precaution against attacks.[1] Three of Wallaroo's crew were killed in the collision, and the corvette sank four hours later with no further casualties while trying to reach Fremantle.[1] The Liberty Ship received minor damage, and made it to port.[1]

The corvette's wartime service was recognised with the battle honour "Pacific 1942".[11][12]

Books

• Donohue, Hector (October 1996). From Empire Defence to the Long Haul: post-war defence policy and its impact on naval force structure planning 1945–1955. Papers in Australian Maritime Affairs. Vol. No. 1. Canberra: Sea Power Centre. ISBN 0-642-25907-0. ISSN 1327-5658. OCLC 36817771.
• Stevens, David (2005). A Critical Vulnerability: the impact of the submarine threat on Australia's maritime defense 1915–1954. Papers in Australian Maritime Affairs. Vol. No. 15. Canberra: Sea Power Centre Australia. ISBN 0-642-29625-1. ISSN 1327-5658. OCLC 62548623.
• Stevens, David; Sears, Jason; Goldrick, James; Cooper, Alastair; Jones, Peter; Spurling, Kathryn (2001). Stevens, David (ed.). The Royal Australian Navy. The Australian Centenary History of Defence (vol III). South Melbourne, VIC: Oxford University Press. ISBN 0-19-554116-2. OCLC 50418095.

Journal and news articles

• Stevens, David (May 2010). "The Australian Corvettes" (PDF). Hindsight (Semaphore). Sea Power Centre – Australia. 2010 (5). Archived from the original (PDF) on 20 March 2011. Retrieved 13 August 2010.

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