HMT Edward Gallagher as HMT Cardiff Castle during WWII
Class overview
Name	Castle class
Operators	Royal Navy  Royal Canadian Navy  Royal New Zealand Navy  Kriegsmarine
Completed	about 280
General characteristics (standard ships)[1][2]
Type	Minesweeper/naval trawler
Tonnage	285 GRT
Displacement	360 tons standard 547 tons fully loaded
Length	134 ft (41 m) LOA 125.5 ft (38.3 m)
Beam	23.5 ft (7.2 m)
Draught	12.7 ft (3.9 m)
Propulsion	1 vertical triple expansion reciprocating engine, 1 boiler, 1 shaft, 480 ihp (360 kW)
Speed	10.5 knots (19.4 km/h; 12.1 mph)
Complement	15, up to 18 with wireless
Armament	Most armed with 76 mm (3 in) 12-pounder gun George Harris, Thomas Bartlett, John Bomkworth 57 mm 6-pounder gun Giovonni Guinti QF 4 in (102 mm) naval gun

The Castle-class minesweeper was a highly seaworthy naval trawler adapted for patrol, anti-submarine warfare and minesweeping duties and built to Admiralty specifications. Altogether 197 were built in the United Kingdom between 1916 and 1919, with others built in Canada, India and later New Zealand. Many saw service in the Second World War.

First World War

The Castle class originated with the commercial trawler Raglan Castle of 1915,^[1][3][4][5] taken up for Royal Navy service. The design was adapted by Smith's Dock Company Ltd to Admiralty requirements for building in quantity.

During World War I, 145 were built in the United Kingdom for the Admiralty. The names of the vessels were derived from the official crew rosters of ships at the Battle of Trafalgar.^[5] Non-standard ships included in the class varied between 236 GRT and 276 GRT, with dimensions varying between 35.8 and 38.3 m (117 and 126 ft) length and 6.71 and 7.17 m (22.0 and 23.5 ft) beam. The first standard vessel, Nathaniel Cole, was delivered in May 1917. After the war 52 further ships on order were completed as fishing vessels and many of the minesweepers were converted for commercial use. 20 ships were also cancelled, but many were completed by the shipbuilders for commercial owners.

The Admiralty also ordered 60 Castle-class trawlers from Canadian shipyards, the TR series, which were loaned to the Royal Canadian Navy for seaward defence of the east coast of Canada. Some entered service with the United States Navy. Nine ships were also built in India with teak planking on steel frames.^[1]

Second World War

Many Castle-class trawlers were among the civilian trawlers requisitioned by the Royal Navy for use in World War II. The majority were employed as minesweepers, with others serving as auxiliary patrol vessels, boom defense vessels, danlayers, Essos (fuel carriers), torpedo recovery vessels and water carriers. Many had multiple roles over the course of the war. After the end of the war, most of those that had survived were either sold or returned to their owners.^[6]

German captured

Early in World War II, ten Canadian-built trawlers that had been sold into commercial service after World War I with a number of European countries were captured by the Germans when they overran France, Belgium and Norway and put in Kriegsmarine service.

New Zealand additions

In 1940, the New Zealand Government, facing a requirement for minesweepers to operate in home waters, directed the building of 13 Castle-class naval trawlers in New Zealand to add to the two vessels, James Cosgrove and Wakakura, they had previously purchased. The Castle-class design was chosen over more modern alternatives because it was simple enough to be built with the country's limited ship construction facilities.^[7][8]

Ships in class

Non-standard

Standard

Ship	Builder	Launched	Completed	Fate	Second World War	WWII Loss
Alexander Palmer (FY3517)	Smiths Dock	21 May 1917	June 1917	Sold 1922 to Spain. Shelled and sunk at Málaga by Almirante Cervera ( Spanish Navy) 9 October 1936.
Alexander Scott (FY3530)	Smiths Dock	3 August 1917	September 1917	Sold 4 May 1920	Alexander Scott (FY515)
Andrew Anderson (FY4405)	Cook, Welton & Gemmell	15 August 1919	April 1920	Completed as fishing vessel, sold 13 February 1922
Andrew Apsley (FY4298)	Cook, Welton & Gemmell	2 June 1919	December 1919	Completed as fishing vessel, sold 13 October 1919	Milford Earl	Bombed 8 December 1941 off east coast of Scotland
Andrew Sack (FY3523)	Smiths Dock	5 July 1917	August 1917	Sold 1924	North Ness (4.100)
Arthur Cavanagh (FY3677)	Bow McLachlan	8 May 1918	28 May 1918	Sold 1925	Arthur Cavenagh (FY566)
Arthur Lessimore (FY3510)	Smiths Dock	9 March 1917	May 1917	Sold 1924	Irvana (FY663)	Bombed 16 January 1942 off Great Yarmouth
Benjamin Cooke (FY3667)	Bow McLachlan	October 2017	1 November 1917	Sold 1922	Namur
Benjamin Stevenson (FY3522)	Smiths Dock	19 June 1917	July 1917	Sunk 18 August 1917 by S/M gunfire 40 miles E. of Fetlar, Shetlands
Charles Antram (FY4401)	Cook, Welton & Gemmell	18 June 1919	February 1920	Completed as fishing vessel, sold 1922	Flanders (FY600)
Charles Boyes (FY3593)	Cook, Welton & Gemmell	1 October 1917	June 1918	Sold 1921	Charles Boyes (FY3677)	Mined 25 May 1940 in the North Sea
Charles Chappell (FY3662)	Bow McLachlan	19 June 1917	July 1917	Sold 1922
Charles Donelly (FY3679)	Bow McLachlan	28 June 1918	12 July 1918	Sold 4 May 1920	Pelagos (4.103)
Charles Legg (FY4213)	J P Rennoldson	19 November 1918	20 January 1919	Sold 1923	Milford Countess (FY564)
Daniel Clowden (FY4446)	George Brown	13 November 1919	13 November 1919	Completed as fishing vessel, sold 8 August 1919	Daniel Clowden (FY531)
Daniel Dick (FY4488)	J P Rennoldson	17 May 1920	25 August 1920	Completed as fishing vessel, sold 1921	Clyth Ness (FY1596)
Daniel Leary (FY4221)	C Rennoldson	30 July 1919	9 July 1920	Completed as fishing vessel, sold 1923
David Dillon (FY4484)	J P Rennoldson	May 2019	28 July 1919	Completed as fishing vessel, sold 28 July 1919	Edward Walmsley (FY624)
David Ogilvie (FY3514)	Smiths Dock	7 May 1917	June 1917	Sold 1919	David Ogilvie (FY720)
Denis Casey (FY3711)	Ailsa	13 December 1917	19/03/1918	Sold July 1920
Dominick Addison (FY4296)	Cook, Welton & Gemmell	2 April 1919	November 1919	Completed as fishing vessel, sold 1919	Gadfly (FY517)
Dominick Dubine (FY3726)	J P Rennoldson	14 March 1918	15 May 1918	Sold 4 May 1920	Fructidor (AD52) - French
Domque Gentile (FY3793)	Ailsa	5 August 1918	October 1918	Sold 1921
Edward Cattelly (FY4459)	Ailsa	17 March 1919	May 1919	Completed as fishing vessel, sold 1919	Loch Naver	Lost 6 May 1940 in collision off Hartlepool
Edward Collingwood (FY3675)	Bow McLachlan	9 April 1918	26 April 1918	Sold 1922	T.R. Ferrens (FY532)
Edward Gallagher (FY4216)	C Rennoldson	14 February 1919	August 1919	Completed as fishing vessel, sold 1919	Cardiff Castle (FY512)
Egilias Akerman (FY4294)	Cook, Welton & Gemmell	18 March 1919	November 1919	Completed as fishing vessel, sold 1919	Computator (FY635)	Sunk 21 January 1945 in collision with HMS Vanoc off Normandy
Emmanuel Camelaire (FY3717)	Ailsa	25 April 1918	May 1918	Sold 1921	Brabant (FY586)
Francis Conlin (FY4458)	Ailsa	21 January 1919	March 1919	Completed as fishing vessel, sold 1919
Frederick Bush (FY3594)	Cook, Welton & Gemmell	14 March 1918	June 1918	Sold 1922
George Adgell (FY4402)	Cook, Welton & Gemmell	18 June 1919	January 1920	Completed as fishing vessel, sold 1920	George Adgell (FY1926)
George Aiken (FY4291)	Cook, Welton & Gemmell	19 December 1918	August 1920	Completed as fishing vessel, sold 1919
George Clarke (FY3714)	J P Rennoldson	2 October 1917	December 1917	Loaned to USN 1919, sold 1923	Lady Stanley (4.233)
George Cochran (FY3721)	Cook, Welton & Gemmell	28 June 1918	December 1918	Loaned to USN 1919, sold 1920
George Corten (FY3697)	Cox & Co	1918	6 February 1919	Sold 1921	Northcoates (FY548)	Sank 2 December 1944 during a storm while under tow off Littlehampton
George Cousins (FY4461)	Ailsa	13 June 1919	August 1919	Completed as fishing vessel, sold 1919	George Cousins (FY627)
George Darby (FY3681)	Bow McLachlan	24 September 1918	21 October 1918	Sold 1923
George Greaves (FY3790)	George Brown	1919	12 May 1919	Completed as fishing vessel, sold 1919	Raglan Castle (FY631)
George Greenfield (FY3787)	George Brown	11 September 1918	15 October 1918	Sold 1921
George Harris (FY3854)	Hepple & Co	20 September 1918	12 December 1918	Sold 11 May 1920	Laxmii (RIN)
Giovanni Guinti (FY3792)	Ailsa	31 May 1918	July 1918	Sold 1920
Griffith Griffith (FY3780)	Cook, Welton & Gemmell	27 August 1918	March 1919	Sold 11 May 1920
Henry Chevallier (FY3673)	Bow McLachlan	13 March 1918	3 April 1918	Sold 1922	Ligny (FY1765)
Henry Cory (FY3698)	Cox & Co	1919	28 May 1919	Completed as fishing vessel, sold 1919	Caliban (FY803)
Isaac Arthan (FY4297)	Cook, Welton & Gemmell	1 May 1919	January 1920	Completed as fishing vessel, sold 1921	Loch Buie (FY688)
Isaac Heath (FY3829)	J P Rennoldson	9 July 1918	21 August 1918	Sold 1920	Teroma (FY527)
James Burgess (FY3653)	C Rennoldson	31 August 1917	October 1917	Sold 1920	Beaumaris Castle (FY993)
James Cepell (FY3718)	George Brown	29 March 1918	May 1918	Sold 1925	Antioche II (AD285) - French
James Chapman (FY3694)	George Brown	8 September 1917	November 1917	Sold 1923
James Christopher (FY3715)	J P Rennoldson	14 January 1918	27 March 1918	Sold 1923	Marsona (FY714)	Mined 4 August 1940 off Cromarty
James Connor (FY3700)	Harkness	19 July 1917	October 1917	Sold 1922 to Spain. Shelled and sunk at Málaga by Almirante Cervera ( Spanish Navy) 9 October 1936.
James Cosgrove (FY3716)	Ailsa	5 March 1918	April 1918	Sold 1919	James Cosgrove (RNZN)
James Dinton (FY3678)	Bow McLachlan	10 May 1918	29 May 1918	Sold 1922	Milford Duke (Z125)
James Gill (FY4217)	C Rennoldson	17 February 1919	November 1919	Completed as fishing vessel, sold 1919	Milford Duchess (FY613)
James Green (FY3537)	Smiths Dock	3 October 1917	November 1917	Sold 1922	Laverock
James Laveney (FY4215)	Chambers	1919	30 October 1919	Completed as fishing vessel, sold 1925	La Blanche II (AD186) - French
James Lay (FY4222)	Fletcher & Fearnall	1918	4 November 1918	Sold 1920	James Lay (FY667)
James Peake (FY3540)	Smiths Dock	17 October 1917	November 1917	Sold 1923
James Pond (FY3515)	Smiths Dock	21 May 1917	June 1917	Sunk 15 February 1918 by German destroyers in the Dover Straits
James Robertson (FY3159)	Smiths Dock	6 June 1917	July 1917	Sold 1922	Capstone (FY1555)
James Seckar (FY3526)	Smiths Dock	20 July 1917	August 1917	Foundered 25 September 1917 in the Atlantic, last seen at 46°30′N 12°00′W / 46.500°N 12.000°W / 46.500; -12.000
James Sibbald (FY3525)	Smiths Dock	20 July 1917	August 1917	Sold 1919	Our Bairns (FY1566)
John Aikenhead (FY4292)	Cook, Welton & Gemmell	19 December 1918	November 1919	Completed as fishing vessel, sold 1919	Polly Johnson	Bombed 29 May 1940 off Dunkirk
John Ashley (FY4293)	Cook, Welton & Gemmell	18 March 1919	November 1919	Completed as fishing vessel, sold 1919
John Baptish (FY3596)	Cook, Welton & Gemmell	29 April 1918	July 1918	Sold 1921	John Baptish
John Bateman (FY3599)	Cook, Welton & Gemmell	29 April 1918	August 1918	Sold 1922
John Bomkworth (FY3597)	Cook, Welton & Gemmell	29 May 1918	July 1918	Sold 1922 to Spain. Wrecked 24 December 1930.
John Bullock (FY3651)	C Rennoldson	9 July 1917	September 1917	Sold 1921	Flying Admiral
John Campbell (FY3695)	George Brown	1 November 1917	December 1917	Sold 1923
John Casewell (FY3713)	Ailsa	3 October 1917	November 1917	Sold 4 May 1920
John Cattling (FY3676)	Bow McLachlan	12 April 1918	29 April 1918	Sold 4 May 1920	John Cattling (FY536)
John Chivers (FY3671)	Bow McLachlan	17 December 1917	December 1917	Sold 1922 to Spain
John Church (FY3668)	Bow McLachlan	16 October 1917	November 1917	Sold 1920
John Clavell (FY4480)	Hepple & Co	14 August 1919	18 October 1920	Completed as fishing vessel, sold 1921
John Collins (FY3712)	Ailsa	19 November 1917	December 1917	Loaned to USN 1919, sold 1920
John Cooper (FY3699)	Harkness	5 July 1917	September 1917	Sold 1922
John Davis (FY3682)	Bow McLachlan	25 September 1918	22 October 1918	Sold 1922
John Dormond (FY4485)	J P Rennoldson	August 1919	15 October 1919	Completed as fishing vessel, sold 1922
John Gauntlet (FY3779)	C Rennoldson	12 August 1918	March 1919	Sold 11 May 1920
John Geoghan (FY3794)	Cook, Welton & Gemmell	9 October 1918	November 1918	Sold 1921	Congre (AD92) - French
John Graham (FY3778)	Ailsa	27 July 1918	January 1919	Loaned to USN 1919, sold 1921	Eastcoates (FY1771)
John Gregory (FY3789)	Cook, Welton & Gemmell	14 February 1919	2 May 1919	Completed as fishing vessel, sold 1919	Nadine (AD57) - French
John Gulipster (FY3782)	George Brown	24 September 1918	April 1919	Completed as fishing vessel, sold 1919	Comitatus (FY633)
John Kidd (FY3508)	Cook, Welton & Gemmell	20 February 1917	May 1917	Sold 11 May 1920	Rotherslade (FY1822)
John Lewis (FY4219)	Smiths Dock	1919	30 March 1920	Completed as fishing vessel, sold 1921	Harry Melling (FY538)
John Lyons (FY3511)	Smiths Dock	23 March 1917	May 1917	Sold 1922
John Pollard (FY3516)	Smiths Dock	21 May 1917	June 1917	Sold 4 May 1920	Grosmont Castle
John Thorling (FY3527)	Smiths Dock	20 July 1917	September 1917	Sold 1925	Concertator (FY637)
Joseph Barratt (FY3586)	Cook, Welton & Gemmell	2 November 1917	March 1918	Sold 1920	Tilbury Ness	Bombed 1 November 1940 in the Thames estuary
Joseph Button (FY3584)	Cook, Welton & Gemmell	17 December 1917	April 1918	Sold 1920	Joseph Button	Mined 22 Oct 1940 off Aldeburgh
Joseph Connell (FY3696)	George Brown	20 December 1917	February 1918	Sold 1922
Joseph Giddice (FY3786)	George Brown	24 October 1918	12 December 1918	Sold 1922
Joseph Gordon (FY3785)	George Brown	29 June 1918	August 1918	Sold 1922	Grouin Du Cou (AD276)- French
Joseph Hodgkins (FY3855)	Hepple & Co	18 December 1918	20 June 1919	Completed as fishing vessel, sold 1919
Joshua Arabin (FY4299)	Cook, Welton & Gemmell	1 May 1919	October 1919	Completed as fishing vessel, sold 1920	De La Pole (FY558)
Matthew Cassady (FY4457)	Ailsa	18 December 1918	February 1919	Completed as fishing vessel, sold 1919
Matthew Flynn (FY3745)	Hepple & Co	17 October 1917	23 February 1918	Sold 1921	Commiles (FY636)
Michael Ging (FY3784)	George Brown	11 May 1918	June 1918	Sold 1922
Michael Griffith (FY3781)	Cook, Welton & Gemmell	5 September 1918	April 1919	Sold 1921	Michael Griffith (FY567)
Michael Maloney (FY3513)	Smiths Dock	7 May 1917	June 1917	Stranded 19 February 1920 at Egersundl, Norway
Morgan Jones (FY3845)	Fletcher & Fearnall	10 March 1918	March 1918	Sold 1920	Morgan Jones (4.114)
Nathaniel Cole (FY3507)	Smiths Dock	20 February 1917	May 1917	Foundered 6 February 1918 off Buncrana, Lough Swilly
Neil Smith (FY3524)	Smiths Dock	5 July 1917	August 1917	Sold 1921	Neil Smith (FY529)
Oliver Pickin (FY3518)	Smiths Dock	21 May 1917	July 1917	Sold 1922	Damito (FY521)
Patrick Bowe (FY3591)	Cook, Welton & Gemmell	17 January 1918	May 1918	Sold 1922 to Spain. Wrecked 1 September 1931.
Patrick Cullen (FY4460)	Ailsa	31 March 1919	June 1919	Completed as fishing vessel, sold 1919
Patrick Donovan (FY4487)	J P Rennoldson	20 February 1920	20 June 1920	Completed as fishing vessel, sold 1922
Peter Blumberry (FY3583)	Cook, Welton & Gemmell	18 October 1917	February 1918	Sold 1921
Peter Carey (FY4445)	George Brown	25 June 1919	October 1919	Completed as fishing vessel, sold 1919	Peter Carey (FY537)
Peter Hall (FY3795)	Ailsa	6 November 1918	December 1918	Sold 1922	Alvis (FY4118)
Peter Killen (FY4207)	Duthie Torry	1919	31 March 1919	Completed as fishing vessel, sold 1919	Sir John Lister (FY622)
Peter Lovett (FY3509)	Smiths Dock	9 March 1917	May 1917	Sold 1922
Philip Godby (FY3783)	Cook, Welton & Gemmell	24 September 1918	May 1919	Completed as fishing vessel, sold 1919
Phineas Beard (FY3588)	Cook, Welton & Gemmell	17 November 1917	March 1918	Sold 1920	Phineas Beard	Bombed 8 December 1941 off Lunan Bay
Richard Bacon (FY3587)	Cook, Welton & Gemmell	2 November 1917	March 1918	Sold 1922	Commodator (FY634)
Richard Crofts (FY3720)	Cook, Welton & Gemmell	13 June 1918	December 1918	Sold 1921	Richard Crofts (FY530)
Richard Cundy (FY4462)	Ailsa	12 August 1919	October 1919	Completed as fishing vessel, sold 1920	River Clyde	Mined 5 August 1940 off Aldeburgh
Richard Roberts (FY3520)	Smiths Dock	6 June 1917	July 1917	Sold 11 May 1920
Robert Bowen (FY3595)	Cook, Welton & Gemmell	14 March 1918	July 1918	Sold 1920	Robert Bowen	Bombed 9 February 1940 off Aberdeen
Robert Cloughton (FY3672)	Bow McLachlan	18 December 1917	December 1917	Boom defence vessel Coronet 1933
Robert Davidson (FY3725)	C Rennoldson	30 November 1917	January 1918	Sold 1921
Samuel Dawson (FY4486)	J P Rennoldson	24 November 1919	5 February 1920	Completed as fishing vessel, sold 1922
Samuel Drake (FY3683)	Bow McLachlan	5 November 1918	26 November 1918	Sold 1924	Southcoates (4.140)
Samuel Green (FY3791)	George Brown	30 April 1919	July 1919	Completed as fishing vessel, sold 1919 and converted to yacht; used as floating restaurant Cruz at Leith.[9] Was "abandoned" from 2007 to 2018, restored into a 1920s style Luxury Hotel and renamed to Ocean Mist, permanently docked at 14 The Shore, Leith.[9]	Ocean Rover
Samuel Spencer (FY3533)	Smiths Dock	17 September 1917	October 1917	Sold 1921
Siam Duffy (FY3684)	Bow McLachlan	6 November 1918	27 November 1918	Loaned to USN 1919, sold 1922	Fontenoy	Bombed 19 Nov 1940 off Lowestoft
Thomas Adney (FY4295)	Cook, Welton & Gemmell	2 April 1919	November 1919	Completed as fishing vessel, sold 1919
Thomas Alexander (FY4404)	Cook, Welton & Gemmell	18 July 1919	June 1920	Completed as fishing vessel, sold 1920	Ben Dearg (FY690)
Thomas Allen (FY4403)	Cook, Welton & Gemmell	18 July 1919	March 1920	Completed as fishing vessel, sold 1922	Milford Prince (FY614)
Thomas Altoft (FY4300)	Cook, Welton & Gemmell	2 June 1919	January 1920	Completed as fishing vessel, sold 1920	Thomas Altoft (FY552)
Thomas Bartlett (FY3598)	Cook, Welton & Gemmell	29 May 1918	August 1918	Sold 11 May 1920	Thomas Bartlett (FY553)	Mined 28 May 1940 off Calais
Thomas Booth (FY3592)	Cook, Welton & Gemmell	14 February 1918	June 1918	Sold 1920
Thomas Boudige (FY4406)	Cook, Welton & Gemmell	15 August 1919	August 1920	Completed as fishing vessel, sold 1921	Darnett Ness (FY542)
Thomas Chambers (FY3670)	Bow McLachlan	1 December 1917	December 1917	Sold 1922	Lorraine (4.170)
Thomas Connolly (FY3589)	Cook, Welton & Gemmell	29 November 1917	April 1918	Sold 1920	Thomas Connolly (Z141)	Mined 17 December 1940 off Sheerness
Thomas Crofton (FY3661)	Bow McLachlan	18 June 1917	July 1917	Sold 4 May 1920	Gwmaho (Z135)
Thomas Daniels (FY3680)	Bow McLachlan	10 July 1918	12 August 1918	Sold 1922
Thomas Dowding (FY3724)	C Rennoldson	16 November 1917	December 1917	Sold 1923	Ben Bheulah (FY1681)
Thomas Goble (FY3539)	Smiths Dock	17 October 1917	November 1917	Sold 1922	Cotsmuir (FY550)
Thomas Green (FY4218)	C Rennoldson	28 May 1919	January 1920	Completed as fishing vessel, sold 1920	Caerphilly Castle
Thomas Hankins (FY3828)	J P Rennoldson	10 May 1918	19/06/1918	Sold 11 May 1920
Thomas Laundry (FY4212)	J P Rennoldson	21 October 1918	27 November 1918	Loaned to USN 1919, sold 11 May 1920
Thomas Lawrie (FY4214)	Chambers	1919	1 October 1919	Completed as fishing vessel, sold 1925
Thomas Leeds (FY4210)	Duthie Torry	June 1919	12 September 1919	Completed as fishing vessel, sold 1919	Thomas Leeds (FY520)
Thomas Robins (FY3531)	Smiths Dock	3 September 1917	September 1917	Sold 4 May 1920
Thomas Twiney (FY3528)	Smiths Dock	20 July 1917	September 1917	Sold 1922
Timothy Crawley (FY3710)	Ailsa	4 October 1917	November 1917	Sold 11 May 1920	Loch Long
Valentine Bower (FY3654)	C Rennoldson	1 October 1917	November 1917	Sold 1923	Milford King (FY1573)
Walter Burke (FY3532)	Smiths Dock	3 September 1917	September 1917	Sold 1922
William Beatty (FY3534)	Smiths Dock	17 September 1917	October 1917	Sold 4 May 1920
William Beeton (FY3652)	C Rennoldson	20 July 1917	September 1917	To Maltese Government 1921
William Bell (FY3590)	Cook, Welton & Gemmell	17 January 1918	May 1918	Sold 1920	William Bell (FY1727)
William Brady (FY3585)	Cook, Welton & Gemmell	17 December 1917	May 1918	Sold 1920	William Brady (4.112)
William Browis (FY3582)	Cook, Welton & Gemmell	18 October 1917	January 1918	Sold 1922	Milford Queen (FY615)
William Bunce (FY3538)	Smiths Dock	3 October 1917	November 1917	Sold 1920	William Bunce
William Caldwell (FY3719)	Cook, Welton & Gemmell	12 June 1918	November 1918	Loaned to USN 1919, sold 11 May 1920	William Caldwell (Z142)
William Cale (FY3666)	Bow McLachlan	19 September 1917	October 1917	Sold 1922	William Cale (FY535)
William Carberry (FY4479)	Hepple & Co	28 June 1919	13 December 1919	Completed as fishing vessel, sold 1919
William Carr (FY3674)	Bow McLachlan	15 March 1918	4 April 1918	Sold 1921	Nazareth (FY1815)
William Carrick (FY3665)	Bow McLachlan	18 September 1917	October 1917	To Indian Government 1920
William Chaseman (FY3529)	Smiths Dock	3 August 1917	September 1917	Sold 4 May 1920	Radnor Castle (FY511)
William Coburne (FY3664)	Bow McLachlan	24 July 1917	August 1917	Sold 1920
William Cowling (FY3663)	Bow McLachlan	23 July 1917	August 1917	Sold 1922	Notre Dame De Lourdes
William Cummins (FY3669)	Bow McLachlan	17 November 1917	November 1917	Sold 1925	Niblick
William Darnold (FY3722)	Cook, Welton & Gemmell	11 July 1918	December 1918	Loaned to USN 1919, sold 11 May 1920
William Downes (FY3723)	C Rennoldson	5 November 1917	December 1917	Sold 1921
William Drake (FY4483)	J P Rennoldson	1919	19 May 1919	Completed as fishing vessel, sold 1919
William Flemming (FY3746)	Hepple & Co	12 February 1918	18 May 1918	Sold 4 May 1920	Tranio (FY3526)	Bombed 26 Jun 1941 while under tow off Smith's Knoll
William Griffths (FY3788)	George Brown	19 November 1918	21 February 1919	Completed as fishing vessel, sold 1919
William Hannam (FY4206)	Duthie Torry	November 1918	20 February 1919	Sold 1920	William Hannam (Z129)
William Humphries (FY4205)	Duthie Torry	October 1918	24 December 1918	Sold 1921
William Knight (FY4208)	Duthie Torry	April 1919	19 June 1919	Completed as fishing vessel, sold 1919	Cobbers	Bombed 3 March 1941 in the North Sea
William Lambkin (FY4209)	Duthie Torry	May 1919	16 July 1919	Completed as fishing vessel, sold 1919
William Leek (FY4211)	J P Rennoldson	August 1918	10 October 1918	Sold 11 May 1920	Hildina (FY541)
William Loft (FY4220)	C Rennoldson	30 August 1919	May 1920	Completed as fishing vessel, sold 1923	Tamora (FY643)
William Mannell (FY3512)	Smiths Dock	23 March 1917	June 1917	Sold 11 May 1920	William Mannel (FY1665)
William Spencer (FY3521)	Smiths Dock	19 June 1917	July 1917	Sold 1924	Astros (Z130)
William Symons (FY3535)	Smiths Dock	1 October 1917	October 1917	Sold 1922	Lephreto (FY519)
William Wilmot (FY3536)	Smiths Dock	1 October 1917	November 1917	Sunk September 1920 in collision with SS Meissonier in the Irish Sea

Cancelled

Canadian-built

See TR series minesweeping trawler.

Indian-built

New Zealand-built

See Castle class trawlers of the Royal New Zealand Navy.