HMCS Agassiz

HMCS Agassiz was a Flower-class corvette of the Royal Canadian Navy. Named after the community of Agassiz, British Columbia, the ship was constructed by Burrard Dry Dock Co. Ltd. in North Vancouver, British Columbia and was launched on 15 August 1940. The corvette was commissioned on 23 January 1941 in Vancouver, British Columbia. The Flower class were initially designed for coastal service during the Second World War, but due to the demands of the Battle of the Atlantic, Agassiz was used primarily as an ocean escort for convoys crossing the Atlantic Ocean in engagements with German submarines. Following the war, the corvette was sold for scrap.

HMCS Agassiz, taken sometime in 1944 or 1945.
History
Canada
NameAgassiz
NamesakeAgassiz, British Columbia
OrderedJanuary 1940
BuilderBurrard Dry Dock Co. Ltd., North Vancouver
Laid down29 April 1940
Launched15 August 1940
Commissioned23 January 1941
Decommissioned14 June 1945
IdentificationPennant number: K129
Honours and
awards		Atlantic 1941–45; Gulf of St. Lawrence 1944
FateSold in 1945 for scrapping
General characteristics
Class and typeFlower-class corvette (original)
Displacement950 long tons (970 t)
Length205 ft 1 in (62.51 m) o/a
Beam33 ft 1 in (10.08 m)
Draught13 ft 5 in (4.09 m)
Propulsion
  • single shaft
  • 2 × Scotch boilers
  • 1 × 4-cylinder triple-expansion reciprocating steam engine
  • 2,750 ihp (2,050 kW)
Speed16 knots (30 km/h; 18 mph)
Range3,450 nmi (6,390 km; 3,970 mi) at 12 kn (22 km/h; 14 mph)
Complement47
Sensors and
processing systems
  • 1 × SW1C or 2C radar
  • 1 × Type 123A or Type 127DV sonar
Armament

Design and description
Main article: Flower-class corvette

Flower-class corvettes like Agassiz serving with the Royal Canadian Navy during the Second World War were different from earlier and more traditional sail-driven corvettes.[1][2] The Flower-class corvettes originated from a need that arose in 1938 to expand the Royal Navy following the Munich Crisis.[3] A design request went out for a small escort for coastal convoys.[4] Based on a traditional whaler-type design, the initial Canadian ships of the Flower class had a standard displacement of 950 long tons (970 t). They were 205 feet 1 inch (62.51 m) long overall with a beam of 33 feet 1 inch (10.08 m) and a maximum draught of 13 feet 5 inches (4.09 m). The initial 1939–1940 corvettes were powered by a four-cylinder vertical triple expansion engine powered by steam from two Scotch boilers turning one three-bladed propeller rated at 2,800 indicated horsepower (2,100 kW). The Scotch boilers were replaced with water-tube boilers in later 1939–1940 and 1940–1941 Programme ships. The corvettes had a maximum speed of 16 knots (30 km/h; 18 mph). This gave them a range of 3,450 nautical miles (6,390 km; 3,970 mi) at 12 knots (22 km/h; 14 mph).[5] The vessels were extremely wet.[6]

The Canadian Flower-class vessels were initially armed with a Mk IX BL 4-inch (102 mm) gun forward on a CP 1 mounting and carried 100 rounds per gun. The corvettes were also armed with a QF Vickers 2-pounder (40 mm, 1.6 in) gun on a bandstand aft, two single-mounted .303 Vickers machine guns or Browning 0.5-calibre machine guns for anti-aircraft defence and two twin-mounted .303 Lewis machine guns, usually sited on bridge wings.[3][5][7] For anti-submarine warfare, they mounted two depth charge throwers and initially carried 25 depth charges. The corvettes were designed with a Type 123 ASDIC sonar set installed. The Flower-class ships had a complement of 47 officers and ratings.[3] The Royal Canadian Navy initially ordered 54 corvettes in 1940 and these were fitted with Mark II Oropesa minesweeping gear used for destroying contact mines.[8] Part of the depth charge rails were made portable so the minesweeping gear could be utilised.[9]

Modifications

In Canadian service the vessels were altered due to experience with the design's deficiencies. The galley was moved further back in the ship and the mess and sleeping quarters combined. A direction-finding set was installed and enlarged bilge keels were installed to reduce rolling.[10] After the first 35–40 corvettes had been constructed, the foremast was shifted aft of the bridge and the mainmast was eliminated. Corvettes were first fitted with basic SW-1 and SW-2 CQ surface warning radar, notable for their fishbone-like antenna and reputation for failure in poor weather or in the dark. The compass house was moved further aft and the open-type bridge was situated in front of it. The ASDIC hut was moved in front and to a lower position on the bridge. The improved Type 271 radar was placed aft, with some units receiving Type 291 radar for air search. The minesweeping gear, a feature of the first 54 corvettes, was removed.[11] Most Canadian Flower-class corvettes had their forecastles extended which improved crew accommodation and seakeeping. Furthermore, the sheer and flare of the bow was increased, which led to an enlarged bridge. This allowed for the installation of Oerlikon 20 mm (0.8 in) cannon, replacing the Browning and Vickers machine guns.[12] Some of the corvettes were rearmed with Hedgehog anti-submarine mortars.[13] The complements of the ships grew throughout the war rising from the initial 47 to as many as 104.[12]

Construction and career

The vessel was ordered as part of the 1939–1940 Progamme in January 1940,[14] and laid down on 29 April 1940 by Burrard Dry Dock Co. Ltd. in North Vancouver, British Columbia. Corvettes commissioned by the Royal Canadian Navy during the Second World War were not named after flowers, as the class name might suggest, but after communities for the most part, to better represent the people who took part in building them. This idea was put forth by Admiral Percy W. Nelles. Sponsors were commonly associated with the community for which the ship was named. Agassiz, named for the town in British Columbia, was launched on 15 August 1940 and commissioned on 23 January 1941 in Vancouver, British Columbia with the pennant number K129.[13]

After completion Agassiz was sent to Halifax, Nova Scotia, with sister ships HMCS Wetaskiwin and HMCS Alberni via the Panama Canal arriving on 13 April 1941.[15] In May 1941 she was assigned to the Newfoundland Escort Force. She served continuously as an ocean escort until the end of 1943.[13] In August 1941, Agassiz was part of the escort 57-ship HX 143 convoy, which was guided around a German U-boat concentration in the North Atlantic.[16] On 1 September 1941, the escort groups were reformed and Agassiz joined Escort Group 19.[17]

On 18 September 1941, the German submarine U-74 sighted the convoy SC 44 in the North Atlantic. The convoy was guarded by the destroyer HMS Chesterfield and the corvettes Agassiz, HMCS Mayflower, HMCS Lévis and HMS Honeysuckle. Only four U-boats moved to engage and during the first night of battle, Lévis was sunk.[18] Agassiz recovered her survivors.[13] Four merchant vessels were sunk as well on 18/19 September. In response to the sinkings, the convoy protection was enhanced with the arrival of three more corvettes.[18]

Agassiz participated in the battle for convoy ON 102 with Mid-Ocean Escort Force (MOEF) group A3 in July 1942. She also fought the battles for convoy SC 97 with MOEF group C2 and the battles for convoy ON 115 and convoy SC 109 with MOEF group C3.[13] During the battle for ON 115, Agassiz opened fire on a surfaced U-boat, then aided in the recovery of the crew of the sunken RMS Lochkatrine. The corvette then took the tanker G. S. Waldron under tow after the ship had been torpedoed and crippled and brought it to safety. The crew received salvage money for the effort.[19] In August 1942, Agassiz was re-assigned to the Caribbean Sea, escorting convoys of oil tankers between Caribbean ports. The corvette was part of the escort of the convoy TAW 12, travelling between Trinidad, Aruba and Key West that lost several ships.[6]

The ship's first major refit took place at Liverpool, Nova Scotia from early January 1943 until mid-March. Following her workups after her first major refit in early 1943, Agassiz was assigned to MOEF group C1 and escorted 12 trans-Atlantic convoys without loss before another major yard overhaul. The second took place at New York, beginning in December 1943 and taking until March 1944 to complete. During her second refit, her forecastle was extended. After that overhaul, Agassiz escorted North American coastal convoys with the Western Local Escort Force from March 1944 until February 1945. In April 1944, she was assigned to escort group W-2 and in August of that year to W-7. She remained with that group until the end of the war.[13][20]

Following the end of hostilities Agassiz was paid off 14 June 1945 at Sydney, Nova Scotia.[13] For service in during the Second World War, Agassiz was awarded the battle honours "Atlantic 1941–45"[21] and "Gulf of St. Lawrence 1944."[22] She was sold for scrap November 1945 and broken up at Moncton, New Brunswick in 1946.[13]

Trans-Atlantic convoys escorted
Convoy Escort Group Dates Notes
OB 347 22–31 July 1941[23] 64 ships escorted without loss from Iceland to dispersal
HX 143 8–17 August 1941[24] 73 ships escorted without loss from Newfoundland to Iceland
ON 8 21–25 August 1941[25] 46 ships escorted without loss from Iceland to Newfoundland
SC 44 12–22 September 1941[26] Newfoundland to Iceland; 4 ships torpedoed & sunk
ON 19A 22 September-4 October 1941[25] Iceland shuttle
SC 50 19–31 October 1941[26] 41 ships escorted without loss from Newfoundland to Iceland
ON 32 6–14 November 1941[25] 49 ships escorted without loss from Iceland to Newfoundland
SC 56 24 November-5 December 1941[26] 45 ships escorted without loss from Newfoundland to Iceland
HX 184 12–19 April 1942[24] 30 ships escorted without loss from Newfoundland to Northern Ireland
ON 91 2–11 May 1942[25] 31 ships escorted without loss from Northern Ireland to Newfoundland
HX 190 MOEF group A3 20–27 May 1942[24] 18 ships escorted without loss from Newfoundland to Northern Ireland
ON 102 MOEF group A3 10–21 June 1942[25] Northern Ireland to Newfoundland; 1 ship torpedoed & sunk
HX 196 MOEF group A3 2–10 July 1942[24] 42 ships escorted without loss from Newfoundland to Northern Ireland
ON 114 MOEF group A3 20–30 July 1942[25] 32 ships escorted without loss from Northern Ireland to Newfoundland
ON 115 MOEF group C3 31 July-3 August 1942[25] battle reinforcement
SC 97 MOEF group C2 22–26 August 1942[26] Newfoundland to Northern Ireland: 2 ships torpedoed & sunk
SC 98 MOEF group C3 2–8 September 1942[26] 69 ships escorted without loss from Newfoundland to Northern Ireland
ON 131 MOEF group C3 19–28 September 1942[25] 54 ships escorted without loss from Northern Ireland to Newfoundland
HX 210 MOEF group C3 7–14 October 1942[24] 36 ships escorted without loss from Newfoundland to Northern Ireland
ON 141 MOEF group C3 26 October-3 November 1942[25] 59 ships escorted without loss from Northern Ireland to Newfoundland
SC 109 MOEF group C3 16–27 November 1942[26] Newfoundland to Northern Ireland; 2 ships torpedoed (1 sank)
ON 152 MOEF group C3 10–28 December 1942[25] 15 ships escorted without loss from Northern Ireland to Newfoundland
SC 127 MOEF group C1 20 April-2 May 1943[26] 55 ships escorted without loss from Newfoundland to Northern Ireland
ON 184 MOEF group C1 16–25 May 1943[25] 39 ships escorted without loss from Northern Ireland to Newfoundland
HX 242 6–14 June 1943[24] 61 ships escorted without loss from Newfoundland to Northern Ireland
ON 190 25 June-3 July 1943[25] 87 ships escorted without loss from Northern Ireland to Newfoundland
HX 247 14–21 July 1943[24] 71 ships escorted without loss from Newfoundland to Northern Ireland
ON 195 1–8 August 1943[25] 51 ships escorted without loss from Northern Ireland to Newfoundland
HX 252 20–27 August 1943[24] 52 ships escorted without loss from Newfoundland to Northern Ireland
ON 201 10–18 September 1943[25] 70 ships escorted without loss from Northern Ireland to Newfoundland
HX 258 28 September-5 October 1943[24] 59 ships escorted without loss from Newfoundland to Northern Ireland
ON 207 19–28 October 1943[25] 52 ships escorted without loss from Northern Ireland to Newfoundland
HX 264 5–16 November 1943[24] 65 ships escorted without loss from Newfoundland to Northern Ireland
ON 213 27 November–7 December 1943[25] 60 ships escorted without loss from Northern Ireland to Newfoundland

References
  1. Fitzsimons 1978, pp. 1137–1142.
  2. Jane's Fighting Ships of World War II, p. 68.
  3. Preston & Raven 1973, p. 1.
  4. McKay & Harland 1993, p. 8.
  5. Lynch 1981, p. 66.
  6. McKay & Harland 1993, p. 11.
  7. McKay & Harland 1993, p. 14.
  8. McKay & Harland 1993, p. 12.
  9. Preston & Raven 1973, pp. 3–4.
  10. Preston & Raven 1973, p. 4.
  11. Lynch 1981, p. 12.
  12. Lynch 1981, pp. 10, 12.
  13. Macpherson & Barrie 2002, p. 103.
  14. Brown 2007, p. 52.
  15. McKay & Harland 1993, p. 10.
  16. Rohwer 2005, p. 90.
  17. Rohwer 2005, p. 97.
  18. Rohwer 2005, p. 100.
  19. McKay & Harland 1993, pp. 10–11.
  20. "Convoy Web". Andrew Hague Convoy Database. Retrieved 27 June 2011.
  21. Thomas 1998, p. 33.
  22. "Royal Canadian Warships – The Battle of the Gulf of St. Lawrence – Second World War". Veterans Affairs Canada. Archived from the original on 27 September 2013. Retrieved 15 August 2013.
  23. "OB convoys". Andrew Hague Convoy Database. Retrieved 6 July 2011.
  24. "HX convoys". Andrew Hague Convoy Database. Retrieved 19 June 2011.
  25. "ON convoys". Andrew Hague Convoy Database. Retrieved 19 June 2011.
  26. "SC convoys". Andrew Hague Convoy Database. Retrieved 19 June 2011.

Sources
  • Brown, David K. (2007). Atlantic Escorts Ships: Ships, Weapons & Tactics in World War II. Barnsley, UK: Seaforth Publishing. ISBN 978-1-84415-702-0.
  • Fitzsimons, Bernard, ed. (1978). The Illustrated Encyclopedia of 20th Century Weapons & Warfare. Vol. 11. London: Phoebus. OCLC 8842839.
  • Jane's Fighting Ships of World War II. New Jersey: Random House. 1996. ISBN 0-517-67963-9.
  • Lynch, Thomas G. (1981). Canada's Flowers, History of the Corvettes of Canada. Halifax, Nova Scotia: Nimbus Publishing. ISBN 0-920852-15-7.
  • Macpherson, Ken & Barrie, Ron (2002). The Ships of Canada's Naval Forces 1910–2002 (Third ed.). St. Catharines, Ontario: Vanwell Publishing. ISBN 1-55125-072-1.
  • McKay, John & Harland, John (1993). Anatomy of the Ship: The Flower Class Corvette Agassiz. St. Catharines, Ontario: Vanwell Publishing. ISBN 1-55068-084-6.
  • Preston, Antony & Raven, Alan (1973). Flower Class Corvettes. Signal. London: Bivouac Books. ISBN 0-85680-004-X.
  • Rohwer, Jürgen (2005). Chronology of the War at Sea 1939–1945: The Naval History of World War Two (Revised & Expanded ed.). Annapolis, Maryland: Naval Institute Press. ISBN 1-59114-119-2.
  • Thomas, David A. (1998). Battles and Honours of the Royal Navy. Barnsley, UK: Leo Cooper. ISBN 085052-623-X.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.