HMS Rising Castle (K398)

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HMS Rising Castle.jpg
As HMCS Arnprior
United Kingdom
Name: Rising Castle
Namesake: Castle Rising
Ordered: 23 January 1943
Builder: Harland and Wolff, Belfast
Yard number: 1240[1]
Laid down: 21 June 1943
Launched: 8 February 1944
Completed: 26 June 1944[1]
Identification: Pennant number: K398
Fate: Transferred to the Royal Canadian Navy
Name: Arnprior
Namesake: Arnprior, Ontario
Commissioned: 8 June 1944
Decommissioned: 14 March 1946
Identification: Pennant number: K494
Honours and
Atlantic 1944–45[2]
Fate: Sold to Uruguay in 1946 and renamed Montevideo
Name: Montevideo
Operator: National Navy of Uruguay
Acquired: 1946
Decommissioned: 1975
Fate: Sold in 1975
General characteristics
Type: Castle-class corvette
Displacement: 1,060 long tons (1,077 t)
Length: 252 ft (77 m)
Beam: 36 ft 8 in (11.18 m)
Draught: 13 ft 6 in (4.11 m)
Installed power: 2,750 ihp (2,050 kW)
  • 2 × water-tube boilers
  • 1 × 4-cylinder triple-expansion steam engine
  • Single screw
Speed: 16.5 knots (30.6 km/h; 19.0 mph)
Range: 9,500 nmi (17,600 km) at 10 kn (19 km/h; 12 mph)
Complement: 112
Sensors and
processing systems:
  • Type 272 radar
  • Type 144Q sonar
  • Type 147B sonar

HMS Rising Castle was a Castle-class corvette built for the Royal Navy in World War II. She was named for Castle Rising in Norfolk, England. Before she was commissioned she was transferred to the Royal Canadian Navy and renamed Arnprior and given a new pennant number. After the war she was sold to Uruguay and renamed Montevideo.


The Castle-class corvettes were an improvement over the previous Flower class for use as a convoy escort, due to their improved seagoing performance. The corvettes displaced 1,060 long tons (1,077 t) with a length of 252 feet (77 m), a beam of 36 feet 8 inches (11.18 m) and a draught of 10 feet (3.0 m).[3]

The ships were powered by two Admiralty 3-drum type water-tube boilers creating 2,750 indicated horsepower (2,050 kW). This powered one 4-cylinder triple-expansion engine, driving one shaft, giving the Castle-class corvettes a maximum speed of 16.5 knots (30.6 km/h; 19.0 mph).[3] The corvettes could carry 480 tons of oil[3] giving them a range of 9,500 nautical miles (17,600 km) at 10 knots (19 km/h; 12 mph).

The class was armed with one 4-inch (102-mm) Quick Firing Mk.XIX High Angle/Low Angle combined air/surface gun,[3] two twin 20 mm anti-aircraft cannons and six single 20 mm anti-aircraft cannons for air/surface combat. For anti-submarine warfare, the ships were equipped with one Squid anti-submarine mortar and one depth charge rail with 15 depth charges.[3]

Construction and career[edit]

Rising Castle was ordered on 23 January 1943.[4] She was built by Harland and Wolff, Belfast and laid down on 21 June 1943. She was launched on 8 February 1944, but was then transferred to the Royal Canadian Navy and commissioned as HMCS Arnprior (with a new pennant number) on 8 June 1944. She was then completed on 26 June 1944. The Canadian Castle-class corvettes were acquired from the Royal Navy in exchange for Algerine-class minesweepers.[5]

War service[edit]

Arnprior was commanded by Lieutenant Charles Van Laughton. He also commanded Agassiz and Cobalt during the war.[6] She worked up at Tobermory, after which she was assigned to the Mid-Ocean Escort Force as part of the convoy escort group C-1, based at Derry. She sailed with convoy ONM-249 on 19 August 1944. She spent the rest of the war serving in the Battle of the Atlantic as a convoy escort. After the end of the war in June 1945, Arnprior was refitted at St. John's, Newfoundland and Labrador. The refit lasted for two months and she was then based at Halifax.[5]

Postwar service[edit]

She was decommissioned on 14 March 1946 and was sold to Uruguay. The ship was renamed Montevideo and operated as a training ship until 1975.[5][7] The ship was broken up in 1975.[8]



  1. ^ a b McCluskie, Tom (2013). The Rise and Fall of Harland and Wolff. Stroud: The History Press. p. 155. ISBN 9780752488615. 
  2. ^ "Battle Honours". Britain's Navy. Retrieved 10 May 2014. 
  3. ^ a b c d e Chesneau, p.63
  4. ^ "HMCS Arnprior (K494)". Retrieved 10 May 2014. 
  5. ^ a b c Macpherson and Barrie, p.161
  6. ^ Obituary of Charles Van Laughton[dead link]
  7. ^ K-494 at Archived 2 October 2011 at the Wayback Machine.
  8. ^ "Arnprior (6117508)". Miramar Ship Index. Retrieved 13 May 2016. (subscription required (help)). 


External links[edit]