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Revision as of 02:04, 1 July 2009

M101/M101A1 105 mm Howitzer
Marines from 11th Marines, 1st Marine Division fire an M101 105 mm Howitzer during the playing of taps at the Iwo Jima 60th Anniversary Commemorative on 26 March 2005
TypeHowitzer
Place of originUnited States of America
Service history
Used byUnited States USA
WarsWorld War II
Korean War
First Indochina War
Vietnam War
Insurgency in the Philippines
Production history
ManufacturerRock Island Arsenal
Produced1941-?
Specifications
Mass2,260 kg (4,980 lb)
Length5.94 m (19.5 ft)
Barrel length22 calibre: 2.31 m (7.6 ft)
Width2.21 m (7.3 ft)
Height1.73 m (5.7 ft)
Shell105x372R
Caliber105 mm (4.1 in)
Breechhorizontal block
Recoilhydropneumatic, constant, 42 in (110 cm)
Carriagesplit trail
Elevation-5° to +66°
Traverse46°
Muzzle velocity472 m/s (1,548 ft/s)
Maximum firing range11,270 m (7.00 mi)

The 105 mm Howitzer M2A1(M101) was the standard light field howitzer for the United States in World War II, seeing action in both European and Pacific theatres. Entering production in 1941, it quickly entered the war against the Imperial Japanese Army in the Pacific, where it gained a reputation for its accuracy and powerful punch. The M101 fired 105 mm high explosive (HE) semi-fixed ammunition and had a range of 11,200 metres (12,200 yd), making it suitable for supporting infantry.

Widespread usage

All of these qualities of the weapon, along with its widespread production, led to its adoption by many countries after the war. Its ammunition type also became the standard for many foreign countries' later models. Minor changes were made after World War II, and the howitzer became known as the M101A1. It continued to see service in the Korean and Vietnam Wars. Though a similar model, the M102 howitzer, shared the same roles in battle, it never fully replaced the M101. Today the 101A1 has been retired by the U.S. military, though it continues to see service with many other countries.

The Canadian Forces continued to use the M2A1 as the C1 Howitzer until 1997 when a modification was made to extend its service life. It is now designated the C3. Those improvements include a longer barrel, a muzzle brake, reinforced trails and the removal of shield flaps. It remains the standard light howitzer of Canadian reserve force units. France and the State of Vietnam used it during the First Indochina War.

A number of M2/M101 howitzers were used by Socialist Federal Republic of Yugoslavia and approximately 50 were inherited by Croatia. Yugoslavia manufactured the M101 as the M56, and 100 of these were inherited by Croatia.

M2 Howitzers are still in service in the Australian Army Reserve, albeit in small numbers. They are gradually being replaced by L118 Light Gun and M198 Howitzers.


This artillery piece was used by 67 countries:
 Greece
 Bahamas
 Argentina
 Brazil
 Canada
 Chile
 Colombia
 Croatia
 Ecuador
{ESA}}
 France
 Guatemala
 Indonesia
 Japan - Japan Ground Self-Defense Force
 Lithuania
 Mexico
 New Zealand
 Paraguay
 Peru
 Philippines
 Uruguay
 South Vietnam
 Serbia
 Cambodia
 Yugoslavia
 Australia
 Thailand
 Turkey
 Myanmar
 Republic of China - Republic of China Marine Corps
 Pakistan - Pakistan Army
Many others

Variants

Canadian soldiers from the 1st and 3rd Field Regiments fire a 105 mm high explosive round with a C3 howitzer March 3, 2009, during Exercise Maritime Raider 09 at Fort Pickett, Va.

Gun variants:

  • M1920 - prototype.[1]
  • M1925E - prototype.[1]
  • T2, standardized as M1.[1]
  • M2 (1934) - minor changes to the chamber to allow use of fixed ammunition.[1]
  • M2A1 (1940) - modified breech ring.[2]
  • M3 - lightweight howitzer, with barrel shortened by 27 inches.
  • T8, standardized as M4 - vehicle-mounted variant with modified breech and with cylindrical recoil surface.[3]: 210 
  • M101 - post-war designation of M2A1 on carriage M2A1.
  • M101A1 - post-war designation of M2A1 on carriage M2A2.
  • C3 - Canadian C1 (M2A1) with lengthened, 33-caliber barrel

Carriage variants:

  • M1920E - prototype, split trail.[1]
  • M1921E - prototype, box trail.[1]
  • M1925E - prototype, box trail.[1]
  • T2, standardized as M1 - split trail, wooden wheels.[1]
  • M1A1 - M1 carriages rebuilt with new wheels, brakes and other parts.[2]
  • T3 - prototype.[1]
  • T4 - prototype.[1]
  • T5, standardized as M2 (1940) - split trail, steel wheels with pneumatic tires.[1]
  • M2A1 - electric brakes removed.[4]
  • M2A2 - modified shield.[4]

Self-propelled mounts

Ammunition

The gun fired semi-fixed ammunition, with 105mm Cartridge Case M14. The propelling charge consisted of base charge and six increments, forming seven charges from 1 (the smallest) to 7 (the largest). Use of M1 HE rounds prepared for the 105mm howitzer M3 (same projectile and cartridge, but different propelling charge) was authorized.[8]

HEAT M67 Shell was originally designed as fixed round, with Cartridge Case M14 type II. It was later changed to semi-fixed type with the standard cartridge, but with non-adjustable propelling charge. For blank ammunition, a shorter Cartridge Case M15 with black powder charge was used.[8]

Available ammunition[7]: 236 [8][9]
Type Model Weight, kg (round/projectile) Filler Muzzle velocity, m/s Range, m
HE HE M1 Shell 19.08 / 14.97 TNT or 50/50 amatol, 2.18 kg 472 11,160
HEAT-T HEAT M67 Shell 16.71 / 13.25 381 7,854
Smoke HC BE M84 Shell 19.02 / 14.91 Zinc chloride (HC) 472 11,160
Smoke, colored BE M84 Shell 17.86-18.04 / Smoke mixture
Smoke WP M60 Shell 19.85 / 15.56 White Phosphorus (WP), 1.84 kg 472 11,110
Smoke FS M60 Shell 20.09 / Sulfur trioxide in Chlorosulfonic acid, 2.09 kg
Chemical H M60 Shell 19.43 / Mustard gas, 1.44 kg
Practice Empty M1 Shell 472 11,160
Drill Drill Cartridge M14 - -
Blank - -
 
Armor penetration, mm[7]: 236 
Ammunition \ Distance, m 0 457 914 1,828
HEAT M67 Shell (meet angle 0°) 102
Concrete penetration, mm[7]: 236 
HE M1 Shell (meet angle 0°) 457 427 396 335
Different methods of measurement were used in different countries / periods. Therefore, direct comparison is often impossible.

See also

  • United Kingdom L118 Light Gun - Lightweight 105mm howitzer designed in the 1970s
  • France LG1 - Modern lightweight 105mm howitzer
  • South Africa G7 - Modern 105 howitzer

Notes

  1. ^ a b c d e f g h i j k Hogg - Allied Artillery of World War Two, p 42-49.
  2. ^ a b Technical Manual TM 9-2005 volume 3, Infantry and Cavalry Accompanying Weapons.
  3. ^ a b c d Hunnicutt - Sherman: A History of the American Medium Tank
  4. ^ a b Technical Manual TM 9-1325, 105mm Howitzers M2 and M2A1; Carriages M2A1 and M2A2; and Combat Vehicle Mounts M3 and M4.
  5. ^ Hunnicutt - Pershing: A History of the Medium Tank T20 Series
  6. ^ a b c d e Hunnicutt - Stuart: A History of the American Light Tank Cite error: The named reference "HUNNICUTT-STUART" was defined multiple times with different content (see the help page).
  7. ^ a b c d Hunnicutt - Half-Track: A History of American Semi-Tracked Vehicles
  8. ^ a b c Technical Manual TM 9-1901, Artillery Ammunition, p 167-178.
  9. ^ Technical Manual TM 9-1904, Ammunition Inspection Guide, p 471-484.

References

  • Hogg, Ian V. (1998). Allied Artillery of World War Two. Crowood Press, Ramsbury. ISBN 1-86126-165-9. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)
  • Hunnicutt, R. P. (1971). Pershing: A History of the Medium Tank T20 Series. Feist Publications. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)
  • Hunnicutt, R. P. (1992). Stuart: A History of the American Light Tank. Presidio Press. ISBN 0-89141-462-2. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)
  • Hunnicutt, R. P. (1994). Sherman: A History of the American Medium Tank. Presidio Press. ISBN 0-89141-080-5. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)
  • Hunnicutt, R. P. (2001). Half-Track: A History of American Semi-Tracked Vehicles. Presidio Press. ISBN 0-89141-742-7. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)
  • Technical Manual TM 9-1325, 105mm Howitzers M2 and M2A1; Carriages M2A1 and M2A2; and Combat Vehicle Mounts M3 and M4. War Department, 1944. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)
  • Technical Manual TM 9-1901, Artillery Ammunition. War Department, 1944. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)
  • Technical Manual TM 9-1904, Ammunition Inspection Guide. War Department, 1944. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)
  • Technical Manual TM 9-2005 volume 3, Infantry and Cavalry Accompanying Weapons. War Department, 1942. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)
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