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2 Inch Medium Mortar
Background and predecessors
As the Western Front in France and Belgium stagnated into trench warfare in late 1914, British forces found themselves with no means of replying to the German minenwerfers (trench mortars) which were lobbing both small and large (over 100 pound) high-explosive shells into their frontline trenches from short range. British commanders requested an accurate short-range weapon which was manually portable in the trenches, could be safely used to attack enemy trenches as close as 100 yards to the British trenches, was easily concealed and projected a reasonably large explosive charge capable of damaging protected enemy positions. The British Expeditionary Force had been expected to participate only in mobile warfare and was not equipped with any mortars.
Various alternative designs for light and medium mortars were evaluated, prompted by the need to get at least some weapon into action without diverting manufacturing capacity from guns and howitzers, which were given priority. Hence the emphasis was on designs for both mortar and ammunition that could be manufactured by small unsophisticated workshops unsuited to other war work :
4 inch mortar
4-inch mortar bomb at the Imperial War Museum
A 4-inch mortar was the only official type to enter service before the end of 1914 (12 units). It fired a 8 pound steel bomb with studs to engage rifling grooves in the mortar barrel, similar to the German minenwerfer. The barrel was improvised by boring out a 6-inch shell. Its range of 900 yards and its accuracy was considered acceptable, but the shell case was expensive and was slow to load. About 40 guns and several thousand rounds were issued by June 1915, with 168 of the total 300 manufactured eventually serving in France. It was soon replaced by the 3-inch Stokes mortar in its "light mortar" class.
3.7 inch mortar
A 3.7 inch pipe gun was an early improvised mortar. 18 were initially made by the Indian Corps in France by December 1914. It was a smooth tube firing a 4 pound "tin-pot" filled with ammonal. The fuze was a length of Bickford fuze ignited by the burning of the propellant, which made it too dangerous for longterm use. By the end of June 1915 another 100 had been manufactured and sent to France and 20 to Gallipoli.
Vickers 1.57 inch mortar
The Vickers 1.57 inch trench mortar was first introduced to France in March 1915, 127 by the end of June, and about 275 were manufactured until it was withdrawn in January 1917 after being replaced by the 2 inch mortar. The 1.57 inch was similar to the eventual 2 inch model, but the particular Vickers design was complicated and expensive to manufacture. It fired either a 18 or 33 pound cast-iron bomb filled with Permite (perchlorate) , but the smaller bomb was considered too light and the heavier had a range of only 200 yards.
The 2-inch Medium Mortar
This was designed and manufactured by the Royal Ordnance Factories in early 1915 and introduced along with the 1.57 inch mortar in March 1915. It incorporated what was known of the German prewar Krupp mortar. This was the first design to meet all the requirements, after modifications to simplify manufacture : it fired a good-sized spherical cast-iron bomb of 42 pounds (total projectile weight 51 pounds with stick and fuze), considered the largest practical size for use from trenches, at ranges from 100 to 600 yards using a simple 2-inch tube as the mortar body; both mortar and ammunition could be cheaply manufactured by small unsophisticated "trade" workshops; the bomb was safely detonated by a standard No. 80 "time and percussion" artillery fuze. Drawbacks were that the steel tail was usually projected backwards towards the firer when the bomb detonated, resulting in occasional casualties; and the No. 80 fuze was also required by the 18-pounder field guns which were given priority, limiting mortar ammunition supply to the front until early 1916 when a special cheap trench mortar fuze was developed.
The 2-inch mortar served in limited numbers in France in 1915 from March, with early mortars and ammunition made by the Royal Ordnance Factory, alongside the Vickers 1.57 inch model. Mass production finally began with an order in August 1915 for 800 mortars from several railway workshops and agricultural machinery makers, together with an order for 675,000 bombs from numerous small firms. This led to the cease of manufacture of the Vickers model, which was twice as expensive, and its withdrawal by January 1917.
It fired a spherical cast-iron bomb "the size of a football" painted dirty white filled with Amatol (identified by a painted green band) or Ammonal (identified by a painted pink band) attached to the end of a pipe ("stick"), hence the nicknames "Toffee Apple" and "Plum Pudding". Weights of bombs as delivered without fuzes varied. Light bombs, from 39 lb 14 oz to below 40 lb 10 oz (18.09 to 18.43 kg), were marked with a stenciled "L". Heavy bombs, above 41 lb 10 oz to 42 lb 6 oz (18.43 to 19.22 kg) were marked with a stenciled "Hv". Hence the total fuzed weight with stick of 51 lb is only an average.
The 2-inch designation refers to the mortar barrel's bore and the projectile stick inserted into it, not the much-larger bomb itself which remained outside the barrel. It was comparable in explosive power if not range to other 4-inch mortars.
The 2-inch mortar was itself superseded by the Newton 6 inch Mortar from mid-1917 onwards. Some Australian units retained them for projecting smoke screens.
Combat use
Typical mortar pit, Mesopotamia 1917, with firing lanyard laid out. The bomb is fuzed.
Deployment
The weapon was initially operated by joint infantry and artillery detachments, eventually it became the responsibility of the Royal Field Artillery. A typical infantry division was equipped with 3 batteries designated X, Y, Z, each with 4 mortars.
Use in action
Its primary use was in cutting barbed wire defenses and attacking enemy front line trenches, such as in the July 1916 attack on the Somme. The spherical shape and relatively low velocity brought the benefit that the bomb did not penetrate the ground before exploding. The short range was a disadvantage as it could only be used if no man's land (between the British and enemy front line) was relatively narrow. It was used to fire some White Star (50%-50% chlorine and phosgene) gas bombs during the Battle of the Somme but only as a stopgap measure until other specialised longer range projectors became available.
Cordite charges appropriate to the required range were dropped into the barrel before the bomb was loaded. Charges and ranges:
1.5 ounces (40 g): 100220 yards (90200 m) (dangerous due to propensity for incomplete burn and hence to fall short)
2.5 ounces (70 g): 180340 yards (160310 m)
3.5 ounces (100 g): 300500 yards (270460 m)
The original design for igniting the powder propellant charge involved the insertion of a standard artillery "T friction tube" into a hole near the base of the barrel. However, the artillery service had a higher priority in receiving the already insufficient number of tubes, so ignition was changed to use a Lee-Enfield bolt mechanism and chamber screwed into a socket in the top of the barrel near the base. A special blank rifle cartridge was loaded and fired via a long lanyard from a sheltered position if possible due to the risk of bombs falling short. This ignited the propellant charge and launched the bomb.
In early use it was situated in frontline trenches but this tended to attract enemy fire onto the troops manning them. Standard procedure became to locate the mortars separately from frontline trenches, in unoccupied trenches or in saps running off the frontline. This had the benefit of drawing enemy fire away from troops manning the front line.
Estimated rounds required for various targets, with instantaneous percussion fuze 107:
Fuze No. 107
Cutting barbed wire: 1 round per 10 square yards (8 m)
Cutting loose wire: 1 round per 6 square yards (5 m)
Destroy trenches frontally: 5 rounds per yard
Destroy trenches in enfilade: 2.5 rounds per yard
Destroy a machine-gun emplacement with top cover not more than 3 feet of earth: 80 rounds
Silencer
Provision was made in mid-1916 for attachment of the "Temple Silencer" at the muzzle, intended to reduce the flash and noise generated on firing, which at the short ranges the mortar operated at was quickly noticed by the enemy and invited artillery response. This required the use of bombs with a special piston attached to the tail which was retained in the barrel by the silencer on firing, and hence sealed the muzzle after the bomb tail left the barrel. This had the major disadvantage of causing the barrel to overheat during prolonged daylight firing, and the silencer was only used at night.
Use as anti-tank mines
British Mk V tank disabled by anti-tank mine, Ronssoy October 3, 1918. Unexploded bombs are visible
In Spring 1918 many of the by-then obsolescent bombs were buried on the Western Front under metal plates as anti-tank mines in expectation of attack by German tanks. This led to some later confusion as to whether unearthed bombs were unexploded mortar projectiles ("Duds") or undetonated mines.
These minefields were inadequately documented. This caused the British problems in the closing months of the war when they had to advance again over territory they had previously abandoned, and also prevented full clearance of the minefields after the war. This led to some French farmers being blown up in the 1930s when they started using tractors e.g. around Gouzeaucourt.
See also
Mortar
Mortier de 58 mm type 2 French equivalent
List of heavy mortars
Surviving examples
This section requires expansion.
Image gallery
Wikimedia Commons has media related to: 2 inch Medium Mortar
Diagram showing loaded mortar
Diagram showing bomb dimensions
Royal Army Ordnance Corps men playing cards on bomb dump, Acheux, July 1916, Battle of the Somme. Sticks not yet attached. Note wooden retaining blocks attached to bombs
Men carrying mortar bombs by their attached carrying straps
Notes
^ Ministry of Munitions 1922, page 130-131
^ "Appendix D. Details of Trench Mortars". Mortar=105 lb; Bed=50 lb; Elevating Stand=50 lb; Tool Box=60 lb; Periscope box=70 lb; Temple silencer=47 lb; Rifle mechanism=5 lb; Total Weight for Transport = 497 lb (225 kg)
^ a b c Handbook of the M.L. 2-Inch Trench Mortar. Mark I. 1917, page 1
^ "No. 351/38. Medium Trench Mortar Battery (Consisting of four mortars)". War Establishments, General, 1916. September 18, 1916.
^ "Appendix D. Details of Trench Mortars". 51 lb was the total projectile weight as fired, including filled bomb, fuze, and stick. The stick weighed about 8 lb (3 kg), the bomb about 42 lb (19 kg).
^ a b Ministry of Munitions 1922, page 65
^ "Appendix E. Details of Ammunition"
^ Ministry of Munitions 1922, page 35, 36
^ Ministry of Munitions 1922, page 62
^ Ministry of Munitions 1922, page 35, 62, 130
^ Ministry of Munitions 1922, page 37
^ Ministry of Munitions 1922, page 37 - 39
^ Ministry of Munitions 1922, page 45, 48
^ a b c Pratt 1965
^ a b Handbook of the M.L. 2-Inch Trench Mortar, Mark I. 1917, page 13
^ Clarke 2004, page 16
^ a b c d Ruffell
^ Jones 2007, page 27
^ Ministry of Munitions 1922, page 55
^ Artillery in Offensive Operations, January 1917
References
Handbook of the M.L. 2-inch trench mortar, Mark I: land service. War Office, United Kingdom, 1917.
"History of the Ministry of Munitions", 1922. Volume XI, Part I Trench Warfare Supplies. Facsimile reprint by Imperial War Museum and Naval & Military Press, 2008 ISBN 1 847348 85 8
Appendix D. Details of Trench Mortars. in Field Artillery Notes No. 7. US Army War College August 1917. Provided online by Combined Arms Research Library
Appendix E. Details of Ammunition. in Field Artillery Notes No. 7. US Army War College August 1917. Provided online by Combined Arms Research Library
"Artillery in Offensive Operations" GHQ Artillery Notes No. 4 January/February 1917. Redistributed by US Army War College August 1917. Provided online by Combined Arms Research Library
Dale Clarke, British Artillery 1914-1919. Field Army Artillery. Osprey Publishing, Oxford UK, 2004 ISBN 1 84176 688 7
Simon Jones, World War I Gas Warfare Tactics and Equipment. Osprey Publishing, Oxford, 2007 ISBN 978 1 84603 151 9
Lt. Colonel E.R. Pratt O.B.E. M.C., "The Origin of a Fuse", 1965.
WL Ruffell, The 2-inch Howitzer
External links
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British Empire Small Arms & Ordnance of the First World War
Rifles, side arms,
Hand grenades
Short Magazine Lee-Enfield rifle Pattern 1914 Enfield rifle Martini-Enfield rifle Ross Rifle (Canada) Webley Revolver Mk. II
Grenade, No 1 No 2 grenade "Hales Pattern" Rifle grenades, 3, 20, 24, 35 Hales No.s 5, 23, 36 Mills No. 6 grenade No.s 8, 9 Double Cylinder Jam Tin No. 13 Battye No. 15 Ball grenade No. 27 Smoke Grenade No. 34 Egg grenade
Artillery
Tank guns
QF 6 pounder Hotchkiss QF 6 pounder 6 cwt
Field Artillery
BL 12 pounder 6 cwt QF 12 pounder 8 cwt QF 12 pounder 18 cwt QF 13 pounder BL 15 pounder BLC 15 pounder QF 15 pounder QF 18 pounder QF 4.5 inch Howitzer
Mountain artillery
RML 2.5 inch Mountain Gun BL 10 pounder Mountain Gun BL 2.75 inch Mountain Gun QF 2.95 inch Mountain Gun QF 3.7 inch Mountain Howitzer
Howitzers, medium,
and heavy artillery
QF 4 inch gun Mk III BL 4 inch gun Mk VII QF 4.7 inch Gun BL 5 inch Howitzer BL 5.4 inch Howitzer BL 60 pounder gun BLC 6 inch siege gun BL 6 inch Gun Mk VII BL 6 inch Gun Mk XIX BL 6 inch 30 cwt howitzer BL 6 inch 26 cwt howitzer BL 8 inch Howitzer Mk I - V BL 8 inch Howitzer Mk VI - VIII
Siege artillery
BL 7.5 inch Mk III naval gun BL 9.2 inch Howitzer BL 9.2 inch Mk X naval gun BL 12 inch Howitzer BL 12 inch Mk X naval gun BL 15 inch Howitzer
Mortars
Garland Mortar 3 inch Stokes Mortar 4 inch Stokes Mortar 2 inch Medium Mortar Newton 6 inch Mortar 9.45 inch Heavy Mortar
Smoke and chemical weapons
4 inch Stokes Mortar Livens Projector
Railway guns
BL 9.2 inch Railway Gun BL 12 inch Railway Gun BL 12 inch railway howitzer BL 14 inch Railway Gun
Anti-aircraft guns
QF 1 pounder pom-pom QF 2 pounder pom-pom QF 12 pounder 12 cwt QF 3 inch 5 cwt QF 13 pounder 6 cwt QF 13 pounder Mk IV QF 13 pounder 9 cwt QF 3 inch 20 cwt QF 18 pounder QF 4 inch Mk V
Machine guns
Vickers machine gun Lewis Gun Maxim gun Hotchkiss Mark I
Foreign weapon designs
in British Army use
Hotchkiss Mark I Lewis Gun 75 mm AA gun QF 15 pounder 9.45 inch Heavy Mortar
Categories: World War I British mortars | World War II artillery of Australia | World War I artillery of Australia | 50 mm artilleryHidden categories: Articles to be expanded from May 2008 | All articles to be expanded
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