Hawthorn M-class destroyer

The Hawthorn M (or Mansfield) Class were a class of two destroyers built for the Royal Navy under the pre-war 1913-14 Programme for World War I service.

Class overview

Builders:	Hawthorn Leslie and Company, Hebburn
Operators:	Royal Navy
Built:	1914–1915
In commission:	1915–1921
Completed:	2
Retired:	2
General characteristics
Type:	Destroyer
Displacement:	1,057 long tons (1,074 t)
Length:	271 ft 6 in (82.75 m) o/a
Beam:	27 ft 6 in (8.38 m)
Draught:	10 ft 6 in (3.20 m)
Depth:	16 ft 9 in (5.11 m)
Propulsion:	Yarrow-type boilers, Parsons I.R. steam turbines, 3 shafts, 27,000 hp (20,134 kW), 300 tons oil fuel
Speed:	35 knots (40 mph; 65 km/h)
Complement:	76
Armament:	3 × QF 4 in (102 mm) Mark IV guns, mounting P Mk.IX 1 × single QF 2-pounder "pom-pom" Mk.II 2 × twin 21 inch (533 mm) torpedo tubes

They were similar to the Admiralty M class, but completed to a modified design by Hawthorn Leslie and Company, Hebburn on Tyne. They had four funnels instead of the three funnels of the Admiralty design; as a consequence, they were the last four-funnelled destroyers (apart from Leaders) to be built for the Royal Navy. The midships 4 inch gun was shipped between the second and third funnels. Both ships were laid down on 9 July 1914 and completed in 1915. Both survived the war and were scrapped in 1921,

Hawthorn Leslie subsequently received orders for two further M class destroyers as part of the large batch of orders placed in May 1915, but these two - Pidgeon and Plover - were built to the Admiralty M class design.

Ships

Mentor, launched 21 August 1914, completed January 1915, sold for breaking up 9 May 1921 to Thos W Ward at Hayle.
Mansfield, launched 3 December 1914, completed April 1915, sold for breaking up 26 October 1921 to Barking Ship Breaking Company.

Bibliography

Destroyers of the Royal Navy, 1893-1981, Maurice Cocker, 1983, Ian Allan ISBN 0-7110-1075-7
Jane's Fighting Ships, 1919, Jane's Publishing

M-class destroyers

Royal Navy

Admiralty M class	Murray Myngs Matchless Milne Morris Moorsom Negro Mandate Mons Michael Marmion Marne Mystic Martial Milbrook Prince Pylades Maenad Mameluke Mindful Nessus Magic Minion Opal Manners Marvel Mary Rose Ossory Mischief Menace Moresby Opportune Munster Noble Napier Onslaught Nonsuch Nestor Oracle Narwhal Nepean Nicator Nomad Onslow Nereus Narborough Pigeon Plover Partridge Medina Pelican Norman Orestes Petard Paladin Nizam Penn Pasley Medway Orford Plucky Observer Peyton Pellew Nonpareil Peregrine Offa Orpheus Octavia Parthian Northesk Oriole Portia Norseman Osiris Oberon Orcadia Oriana Ophelia Pheasant Obedient North Star Phoebe Obdurate Nugent
Hawthorn M class	Mentor Mansfield
Thornycroft M class	Meteor Mastiff Patriot Patrician Rapid Ready
Yarrow M class	Miranda Minos Manly Moon Morning Star Mounsey Musketeer Nerissa Relentless Rival
Yarrow Later M class	Sabrina Strongbow Surprise Sybille Truculent Tyrant Ulleswater

Royal Canadian Navy

Thornycroft M class	Patriot Patrician

Preceded by: Laforey class
Followed by: R class

List of destroyers of the Royal Navy

British naval ship classes of the First World War
Aircraft/Seaplane carriers	Empress^S^V Riviera^S^V Engadine^S^V Ark Royal^S Ben-my-Chree^S^V Campania^S^V Raven II^S^V Anne^S^V Vindex^S^V Manxman^S^V Furious^M Pegasus^S^V Nairana^S^V Argus^S^V Vindictive^S^V
Dreadnought battleships	Dreadnought^S Bellerophon St Vincent Neptune^S Colossus Orion King George V Erin^S Agincourt^S Iron Duke Canada^S Queen Elizabeth Revenge
Pre-dreadnought battleships	Royal Sovereign Majestic Canopus Formidable London Duncan King Edward VII Swiftsure Lord Nelson
Battlecruisers	Invincible Indefatigable Lion Queen Mary^S Tiger^S Renown Courageous Admiral^S^C Incomparable^X
Armoured cruisers	Cressy Drake Monmouth Devonshire Duke of Edinburgh Warrior Minotaur
Heavy cruisers	Hawkins
Light cruisers	Town^G Arethusa C^{G, C} Danae^C Emerald^A
Protected cruisers	Apollo Astraea Eclipse Blake Pearl Edgar Powerful Diadem Arrogant Pelorus Highflyer Challenger Topaze
Scout cruisers	Adventure Forward Pathfinder Sentinel Boadicea Blonde Active
Destroyer flotilla leaders	Swift^S Faulknor Marksman Parker Thornycroft (or Shakespeare)^C Admiralty (or Scott)^C
Destroyers	A^G B^G C^G D^G E^G F G H I K L Admiralty M Hawthorn M Thornycroft M Yarrow M Yarrow Later M Medea Arno^S R^G S^{G, C} Talisman V and W^{G, C}
Torpedo boats	TB 81^S TB 98 TB 109 TB 114 Cricket^G
Monitors	Marshal Ney Abercrombie Lord Clive Humber Gorgon M15 M29 Erebus
Minesweepers	Flower Racecourse Hunt Dance 24^C
Gunboats	Fly Insect
Submarines	A B C D E F G H^C J K L^C M^C R^C Swordfish^S V
A All completed after the war C One or more completed after the war G Grouping of several classes M converted from Courageous class S Single ship of class V Conversions X Cancelled

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