M8 Greyhound

M8 armored car

A preserved M8 on display (2008)
Type Armored car
Place of origin United States
Specifications
Weight 8.6 short tons (7.8 t)
Length 16 ft 4.8 in (5.00 m)[1]
Width 8 ft 3.6 in (2.53 m)[1]
Height 7 ft 4.8 in (2.26 m)[1]
Crew 4[1]
Main
armament
 One 37 mm gun M6[1]
Secondary
armament
 One .30 cal (7.62 mm) Browning M1919 machine gun
One .50 cal (12.7 mm) Browning M2HB machine gun
Engine Hercules JXD 6 cylinder gasoline engine
110 hp (82 kW)[1]
Power/weight 14.1 hp/tonne
Suspension 6×6 wheeled, leaf spring
Operational
range
 200-400 miles on road
150-200 miles off road[1]
Speed 55 mph (89 km/h)

The M8 light armored car is a 6×6 armored car produced by the Ford Motor Company during World War II. It was used by the United States and British troops in Europe and the Far East until the end of the war.[2] The vehicle was widely exported and as of 2006 still remains in service with some Third World countries.[2]

In British service, the M8 was known as the "Greyhound", a nickname seldom if ever used by the US. The British Army found it too lightly armored, particularly the hull floor, which anti-tank mines could easily penetrate (the crews' solution was lining the floor of the crew compartment with sandbags). Nevertheless, it was produced in large numbers. The M8 Greyhound's excellent on-road mobility made it a great supportive element in the advancing American and British armored columns. It was marginal off-road, especially in mud.

Development history

In July 1941, the ordnance department initiated the development of a new fast tank destroyer to replace the M6 37 mm gun motor carriage, which was essentially a ¾-ton truck with a 37 mm gun installed in the rear bed.[2] The requirement was for a 6×4 wheeled vehicle armed with a 37 mm gun, a coaxial machine gun mounted in a turret, and a machine gun in the front hull.[2] Its glacis armor was supposed to withstand fire from a .50 in (12.7 mm) machine gun and side armor from a .30 in (7.62 mm) machine gun. Prototypes were submitted by Studebaker (designated T21), Ford (T22) and Chrysler (T23), all of them quite similar in design and appearance.

In April 1942, the T22 was selected, despite complaints about deficiencies, due to the need for vehicles. By then, it was clear that the 37 mm gun would not be effective against the front armor of German tanks; so, the new armored car, now designated the M8, took on a reconnaissance role instead.[2] Contract issues and minor design improvements delayed serial production until March 1943. Production ended in June 1945.[2] A total of 8,523 units were built,[1] excluding the M20 armored utility car (see variants). The M8 was manufactured at the Ford Motor Company plant in Saint Paul, Minnesota.

In May 1942, having viewed the prototype, the British Tank Mission turned down the offer to acquire the M8 through Lend-Lease.[2] It was named "Greyhound" in keeping with other U.S. armored cars already ordered by the British, such as the (cancelled) T18 Boarhound, the T17 Deerhound, the T17E1 Staghound and the (also cancelled) M38 Wolfhound.

Mission and operational performance

Radio inside an M8

The cavalry reconnaissance troops (equivalent to companies and assigned to infantry divisions) and squadrons (equivalent to battalions and assigned to armored divisions or independent and used at the whim of a division or corps commander) used by the US Army served as advance "eyes and ears". This mission demanded an emphasis on speed and agility, rather than firepower and armor. When on the march, the cavalry's mission was to make contact with enemy forces at the earliest practical moment and maintain it thereafter. In this role, the recon troops identified hostile units and reported their strength, composition, disposition and movement. During withdrawals, the cavalry often served as a screening force for the main units.

The M8 performed this function with distinction. Each M8 armored car was equipped with a long-range radio set to assist in the exercise of command, or for the purpose of relaying information received from subordinate elements to higher headquarters. Another short-range radio set served to communicate within a cavalry reconnaissance platoon, reconnaissance team, or with headquarters. The M8 weighed 16,400 lb (7,400 kg) fully loaded with equipment and crew, and was capable of cruising 100–200 mi (160–320 km) cross country or 200–400 mi (320–640 km) on highways without refueling. On normal roads, it was capable of a sustained speed of 55 mph (89 km/h), hence its nickname.

The telescopic sight used to aim the main 37 mm gun

The M8 was not designed for offensive combat, and its firepower was adequate only against similar lightly armored enemy vehicles and infantry. The vehicle's armor provided a fair degree of protection against small-arms fire but nothing more. With a meager .25 in (6 mm) of floor armor, the M8 was particularly vulnerable to German mines.

The vehicle's other drawback was limited mobility in heavily wooded areas and on broken terrain; armored cavalry units preferred using the ¼-ton reconnaissance car (Jeep) in these environments. A large turning radius, limited wheel travel, open differentials, and limited cross-country mobility made the M8 armored car susceptible to immobilization off-road in off-camber terrain and defiles. This limited operators to using the vehicle mostly on existing roads and paths, where it became vulnerable to ambush. The lack of continuous tracks like a tank led to a high ground pressure and hampered its off-road performance in mud, snow and alpine terrain and the M8 frequently sank to its axles. Conversely, the performance of the M8 on hard surfaces was exceptional, with the vehicle having long range and able to consistently maintain its top speed of 55 mph. As a wheeled vehicle, the M8 was generally more reliable than tracked vehicles of similar size, and required far less maintenance and logistics support.

Description

Shells for the main 37 mm gun are stored on racks inside the turret. The barrel of an M1 carbine, carried for close-in vehicular defense, is visible at left.

The M8's armor was thin, but it provided protection for the crew from small-arms fire and shrapnel, enough so that the vehicle could carry out its main mission of reconnaissance. The frontal, sloped hull armor varied in thickness from 0.5 inches to 0.75 inches (15.8 to 19 mm) The side and rear hull armor, also sloped but slightly less so than the front, was 0.375 inches (9.5 mm) thick. The top armor was 0.25 inches (6.4 mm) thick, as was the floor. The turret was comparatively better protected than the hull, being 0.75 inches (19 mm) thick all around, with an 0.25-inch (6.4 mm) partial roof. The cast, rounded gun shield was uniformly 1 inch (25.4 mm) thick.[3]

The M8 was fitted with a 37 mm M6 gun (aimed by an M70D telescopic sight) and a coaxially mounted .30 in (7.62 mm) Browning machine gun in a one-piece, cast mantlet, mounted in an open-topped, welded turret. The M8 was initially fitted without any kind of anti-aircraft defense; as a stopgap solution, a .50 caliber Browning M2HB machine gun on a ring mount was retrofitted to nearly all vehicles already in service. A purposefully-designed pintle was mounted on all late-production vehicles, but it saw comparatively little action due to a troubled development process.

The crew of four comprised a commander (who doubled as the loader), gunner, driver, and radio operator (who could also act as a driver). The driver and radio operator were seated in the forward section of the hull, while the commander and gunner sat in the turret, with the commander seated on the right, and the gunner on the left,

The vehicle carried 80 37 mm rounds (16 in the turret and 64 in an ammunition rack in the right sponson) when fitted with a single radio. Vehicles with a second radio installed only carried 16 main gun rounds. Some units solved this problem by cutting up the removed main ammunition rack and stowing 18 rounds in each sponson, under the radios. This raised the number of main gun rounds able to be carried to 52. Another modification (the most common one) involved fabricating (again from the discarded main ammunition rack) a 43-round bin to be placed behind the driver's seat, and a 20-round bin attached to the framing of the turret basket. This raised the ammunition capacity up to 79 rounds.[2] Machine gun ammunition consisted of 1,500 .30 caliber rounds and 400 .50 caliber rounds. In addition, the vehicle carried a mix of 16 smoke and hand grenades, four smoke pots, six M1 anti-tank mines and four M1 carbines for the crew.

The M8 was powered by a Hercules Model JXD in-line six-cylinder 320 in³ gasoline engine giving it a top speed of 55 mph (88 kph) on-road, and 30 mph (48 km/h) off-road. With a 59-gallon fuel tank and an average fuel consumption of 7.5 mpg, it could manage an average road range of 200–400 miles (320–640 km) The Hercules JXD ran more quietly than other engines of comparable power, which helped the M8 maintain an element of surprise and reduce the chance of being heard by the enemy. Because of this, the M8 armored cars in Patton's Third Army were known as "Patton's ghosts", since they were almost never detected by the Germans until it was too late.

Service history

World War II

The M8 light armored car, the "Greyhound", entered combat service with the Allies in 1943. It was purpose designed to serve as the primary basic command and communication combat vehicle of the U.S. Cavalry Reconnaissance Troops.

The M8 first saw action in Sicily in 1943 and was subsequently used by the U.S. Army in Italy, Europe, and the Pacific. In the latter theater, it was used mostly on Okinawa and the Philippines, and was even employed in its original tank destroyer role as most Japanese tanks had armor that was vulnerable to its 37 mm gun.

Over 1,000 were supplied via lend-lease channels to US allies; United Kingdom, Free France and Brazil.

American troops in an M8 passing the Arc de Triomphe after the liberation of Paris

The vehicle was considered fast, sufficiently reliable (after some technical problems were solved) and armed and armored well enough for reconnaissance missions. However, cavalry units criticized its off-road performance, which was even worse than the M3A1 scout car it replaced. In the mountainous terrain of Italy and in the deep mud and snow of North European winter, the M8 was more or less restricted to roads, which greatly reduced its value as a reconnaissance vehicle. It was also very vulnerable to landmines. An add-on armor kit was designed to provide an extra quarter-inch of belly armor to reduce landmine vulnerability. Some crews placed sandbags on the floor to make up for the thin belly armor. Another problem was that commanders often used their reconnaissance squadrons for fire support missions, for which the thinly-armored M8 was ill-suited. When it encountered German armored reconnaissance units, the M8 could easily penetrate their armor with its 37 mm gun. Conversely, its own thin armor was vulnerable to the 20 mm autocannons that German scout cars were equipped with.

During the Battle of St. Vith in the Battle of the Bulge, an M8 of Troop B, 87th Cavalry Reconnaissance Squadron was able to destroy a German Tiger I heavy tank. The M8 fired three 37 mm rounds through the relatively thin rear armor of the Tiger from only 25 yd (23 m), setting it on fire.[4]

The U.S. Army started to look for a replacement for the M8 as early as 1943. Two prototypes, the Studebaker T27 and Chevrolet T28 were finished in summer 1944. Both were found to be superior to the M8, but it was decided that, at that stage of the war, there was no more need for a new armored car.

Post-war

M8 armored car on occupation duty with constabulary markings, 1952

After the war, the M8 was used for occupation duty; it also saw combat in the Korean War, being retired by the U.S. Army shortly thereafter. In French use, the M8 was used during the Indochina War (1946–1954) and Algerian War (1954–1962). Many vehicles formerly used by the U.S., Britain and France were exported to NATO allies and third world countries. As of 2002, some still remained in service in Africa and South America.

During the Vietnam War, the French organized Vietnamese armored regiments, each consisting of three companies equipped with a mixture of M3 half-tracks, M3 scout cars, M8 Greyhound armored cars and M8 self-propelled howitzers.

During the Congo Crisis, Indian peacekeepers with recoilless rifles destroyed at least one ex-Belgian Greyhound manned by Katangese separatists. The armored cars were deployed on both sides during UN attempts to end Katanga's ill-fated secession.[5]

Several Greyhounds were deployed in Bogota on March 8, 2007, as part of the security measures for U.S. President George W. Bush's visit. They are regularly used as checkpoint security by the Colombian military, and usually can be seen in the northern parts of the capital.

List of operators

Variants

T22.
M20 armored utility car at the US Army Ordnance Museum.
T69 multiple gun motor carriage

See also

Notes

Notes
  1. ↑ captured in World War II and saw service with the West German Border Guard after the war.
Citations
  1. 1 2 3 4 5 6 7 8 Livesey, Jack (2007). Armoured Fighting Vehicles of World Wars I and II. Southwater. p. 71. ISBN 978-1-84476-370-2.
  2. 1 2 3 4 5 6 7 8 Zaloga, Steve (2002). M8 Greyhound Light Armored Car. Osprey. ISBN 1-84176-468-X.
  3. ↑ "Light Armored Car M8 Greyhound".
  4. ↑ U. S. Army Armor School Staff (1998), The Battle at St. Vith, Belgium, 17–23 December 1944: An Historical Example of Armor in the Defense, Merriam Press, pp. 31–32, ISBN 978-1-57638-145-8
  5. 1 2 Tom, Cooper (2 September 2003). "Congo, Part 1; 1960-1963". Air Combat Information Group. Retrieved 2013-08-09.
  6. ↑ M8 Greyhound milik Polisi (Museum exhibit), South Jakarta, Indonesia: Satriamandala Museum, 2014

References

External links

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