|Medium Tank M3|
Medium Tank M3, Fort Knox, June 1942
|Place of origin||United States|
|Wars||World War II|
|Produced||August 1941–December 1942|
|Variants||numerous, see text|
|Weight||30 short tons (27 t)|
|Length||18 ft 6 in (5.64 m)|
|Width||8 ft 11 in (2.72 m)|
|Height||10 ft 3 in (3.12 m) - Lee|
|Crew||7 (Lee) or 6 (Grant)|
|1 × 75 mm Gun M2/M3 in hull
1 × 37mm Gun M5/M6 in turret
|2-3–4 × .30-06 Browning M1919A4 machine guns
|Engine||Wright (Continental) R975 EC2
400 hp (300 kW)/340 hp (250 kW)
|Transmission||Synchromesh, 5 speeds forward, 1 reverse|
|Suspension||vertical volute spring|
|Ground clearance||18 in (0.46 m)|
|Fuel capacity||662 liters (175 US gallons)|
|193 km (119 mi)|
|Speed||26 mph (42 km/h) (road)
16 mph (26 km/h) (off-road)
The Medium Tank M3 was an American tank used during World War II. In Britain the tank was called by two names based on the turret configuration. Tanks employing US pattern turrets were called the "Lee", named after Confederate General Robert E. Lee. Variants using British pattern turrets were known as "Grant", named after U.S. General Ulysses S. Grant.
Design commenced in July 1940 and the first M3s were operational in late 1941. The U.S. Army needed a good tank and coupled with the United Kingdom's demand for 3,650 medium tanks immediately, the Lee began production by late 1940. The design was a compromise meant to produce a tank as soon as possible. The M3 had considerable firepower as it was well armed and provided good protection, but had certain serious drawbacks in its general design and shape, such as: a high silhouette, an archaic sponson mounting of the main gun, riveted construction, and poor off-road performance. Its overall performance was not satisfactory and the tank was withdrawn from front line duty — except in the remote areas of the Asian Theater where it was used by British forces until mid-1944 or possibly later — as soon as the M4 Sherman became available in large numbers. In spite of this it was considered by Hans von Luck superior to the best German tank at the time of its introduction, the Panzer IV.
- 1 History
- 2 Service history
- 3 Variants
- 4 Designs based on chassis
- 5 Operators
- 6 Film appearances
- 7 See also
- 8 Notes
- 9 References
- 10 External links
In 1939, the U.S. Army possessed approximately 400 tanks, mostly M2 Light Tanks, with 18 of the to-be-discontinued M2 Medium Tanks as the only ones considered "modern". The U.S. funded tank development poorly during the interwar years, and had no infrastructure for production, little experience in design, and poor doctrine to guide design efforts.
The M2 medium tank was typical of armored fighting vehicles (AFVs) many nations produced in 1939. When the U.S. entered the war, the M2 design was already obsolete with a 37 mm gun, 32 mm frontal armor, excessive machine gun secondary armament and a very high silhouette. The Panzer III and Panzer IV's success in the French campaign led the U.S. Army to order immediately a new medium tank armed with a 75 mm gun in a turret. This would be the M4 Sherman. Until the Sherman reached production, an interim design with a 75 mm gun was urgently needed.
The M3 was the solution. The design was unusual because the main weapon — a larger caliber, low-velocity 75 mm gun — was in an offset sponson mounted in the hull with limited traverse. (The sponson mount was necessary because at the time American tank plants were incapable of casting a turret big enough to hold the 75mm main gun). A small turret with a lighter, high-velocity 37 mm gun sat on the tall hull. A small cupola on top of the turret held a machine gun. The use of two main guns was seen on the French Char B, the Soviet T-35, and the Mark I version of the British Churchill tank. In each case, two weapons were mounted to give the tanks adequate capability in firing both anti-personnel high explosive ammunition and armor-piercing ammunition for anti-tank combat. The M3 differed slightly from this pattern having a main gun which could fire an armor-piercing projectile at a velocity high enough for efficiently piercing armor, as well as deliver a high-explosive shell that was large enough to be effective. Using a hull mounted gun, the M3 design could be produced faster than a tank featuring a turreted gun. It was understood that the M3 design was flawed, but Britain urgently needed tanks.
The M3 was tall and roomy: the power transmission ran through the crew compartment under the turret cage to the gearbox driving the front sprockets. Steering was by differential braking, with a turning circle of 37 ft (11 m). The vertical volute-sprung suspension (VVSS) units possessed a return roller mounted directly atop the main housing of each of the six suspension units (three per side), designed as self-contained and readily replaced modular units bolted to the hull sides. The turret was power-traversed by an electro-hydraulic system in the form of an electric motor providing the pressure for the hydraulic motor. This fully rotated the turret in 15 seconds. Control was from a spade grip on the gun. The same motor provided pressure for the gun stabilizing system.
The 75-mm was operated by a gunner and a loader. Sighting the 75-mm gun used an M1 periscope — with an integral telescope — on the top of the sponson. The periscope rotated with the gun. The sight was marked from zero to 3,000 yd (2,700 m) with vertical markings to aid deflection shooting at a moving target. The gunner laid the gun on target through geared handwheels for traverse and elevation.
The 37-mm was aimed through the M2 periscope, though this was mounted in the mantlet to the side of the gun. It also sighted the coaxial machine gun. Two range scales were provided: 0-1,500 yd (1,400 m) for the 37-mm and 0-1,000 yd (910 m) for the machine gun.
Though not at war, the U.S. was willing to produce, sell and ship armored vehicles to Britain. The British had requested that their Matilda and Crusader tank designs be made by American factories, but this request was refused. With much of their equipment left on the beaches near Dunkirk, the equipment needs of the British were acute. Though not entirely satisfied with the design, they ordered the M3 in large numbers. British experts had viewed the mock-up in 1940 and identified features which they considered flaws — the high profile, the hull mounted main gun, the lack of a radio in the turret (though the tank did have a radio down in the hull), the riveted armor plating (whose rivets tended to pop off inside the interior in a deadly ricochet when the tank was hit by a non-penetrating round), the smooth track design, insufficient armor plating and lack of splash-proofing of the joints. The British desired modifications for the tank they were purchasing, including the turret being cast rather than riveted. A bustle was to be made at the back of the turret to house the Wireless Set No. 19. The tank was to be given thicker armor plate than the original U.S. design, and the machine gun cupola was to be replaced with a simple hatch. With these modifications accepted the British ordered 1,250 M3s. The order was subsequently increased with the expectation that when the M4 Sherman was available it could replace part of the order. Contracts were arranged with three U.S. companies. The total cost of the order was approximately 240 million US dollars, the sum of all British funds in the US; it took the US Lend-Lease act to solve the financial shortfall.
The prototype was completed in March 1941 and production models followed, with the first British-specification tanks produced in July. Both U.S. and British tanks had thicker armor than first planned. The British design required one fewer crew member than the US version due to the radio in the turret. The U.S. eventually eliminated the full-time radio operator, assigning the task to the driver. After extensive losses in Africa and Greece the British realized that to meet their needs for tanks both the Lee and the Grant types would need to be accepted.
The U.S. military used the "M" (Model) letter to designate nearly all of their equipment. When the British Army received their new M3 medium tanks from the US, confusion immediately set in between the different M3 medium tank and M3 light tank. The British Army began naming their American tanks after American military figures, although the U.S. Army never used those terms until after the war. M3 tanks with the cast turret and radio setup received the name "General Grant", while the original M3s were called "General Lee", or more usually just "Grant" and "Lee". The M3 brought much-needed firepower to British forces in the North African desert campaign.
The chassis and running gear of the M3 design was adapted by the Canadians for their Ram tank. The hull of the M3 was also used for self-propelled artillery as with the original design of the M7 Priest, of which nearly 3,500 were built, and recovery vehicles.
North African theater
Of the 6,258 M3s produced by the U.S., 2,855 M3s were supplied to the British Army, and about 1,386 to the Soviet Union. The American M3 medium tank's first action during the war was in 1942, during the North African Campaign. British Lees and Grants were in action against Rommel's forces at the Battle of Gazala on 27 May that year. Their appearance was a surprise to the Germans, who were unprepared for the M3s 75 mm gun. They soon discovered the M3 could engage them beyond the effective range of their 5 cm Pak 38 anti-tank gun, and the 5 cm KwK 39 of the Panzer III, their main medium tank. The M3 was also vastly superior to the Fiat M13/40 and M14/41 tanks employed by the Italian troops, whose 47 mm gun was effective only at point blank range, while only the few Semoventi da 75/18 self-propelled guns were able to destroy it using HEAT rounds. Grants and Lees served with the British in North Africa until the end of the campaign. Following Operation Torch (the invasion of French North Africa), the U.S. also fought in North Africa using the M3 Lee. The U.S. 1st Armored Division had given up their new M4 Shermans to the British prior to the Second Battle of El Alamein. Subsequently, a regiment of the division was still using the M3 Lee when they arrived to fight in North Africa. The M3 was generally appreciated during the North African campaign for its mechanical reliability, good armor protection and heavy firepower. Yellow banding on turret was applied to depict service in North Africa.
In all three areas, the M3 was able to engage German tanks and towed anti-tank guns. Yet the tall silhouette and low, hull-mounted 75-mm were tactical drawbacks, since they prevented fighting from a hull-down firing position. The use of riveted hull superstructure armor on the early versions led to spalling, where the impact of enemy shells caused the rivets to break off and become projectiles inside the tank. Later models were built with all-welded armor to eliminate this problem. These lessons were applied to the design and production of the M4. The M3 was replaced by the M4 Sherman as soon as the M4 was available, though several M3s saw limited action in the battle for Normandy as armored recovery vehicles; their armament replaced with dummy guns.
As the Soviets used diesel fuel for their tanks, the 1,300 M3A3 and M3A5s were supplied to the USSR with General Motors-built twin diesel engines. These were supplied through the Lend-Lease program in 1942-1943. All were Lee variants, although the Soviets sometimes referred to them generically as Grants. The M3 was unpopular in the Red Army, which already used the more modern T-34. The faults of the M3 Lee revealed themselves in engagements against enemy armor and anti-tank weapons; the Soviets gave it the nickname Братская могила на шестерых ("a grave for six"). The official Soviet designation was М3с (М3 средний, "M3 medium") to distinguish them from М3л (М3 лёгкий, "M3 light") Stuart tanks. With the Soviet Union producing close to 1,500 T-34s a month, their use of the M3 Lee declined after mid-1943. The Soviets still used them on secondary fronts, such as in the Arctic during the Red Army's Petsamo–Kirkenes Offensive in October 1944.
In the Pacific War tank warfare played a secondary role as the primary battles were fought with naval and aerial forces. In the Pacific Ocean Theater and Southwest Pacific Theater, the U.S. Army deployed only a third of its 70 separate tank battalions, and none of its armored divisions, while the U.S. Marine Corps deployed all six of its tank battalions. 
When the British Army received M4 Shermans, about 900 M3 tanks were transferred to the Indian Army and some of these saw action in the war in South East Asia. British Lees and Grants were used by the British Fourteenth Army until the fall of Rangoon, performing "admirably" in Burma in 1944-45, in its original role: supporting infantry. In the Far East, the M3's main task was infantry support. It played a pivotal role during the Battle of Imphal, during which the Imperial Japanese Army's 14th Tank Regiment (consisting of mostly captured British M3 Stuart light tanks and their own Type 95 Ha-Go light tanks) encountered M3 medium tanks for the first time and found itself outgunned and outmatched by the British armor. Despite their worse-than-average off-road performance, the M3s performed well as they traversed the steep hillsides around Imphal. Officially declared obsolete in April 1944, the Lee nevertheless saw action until the end of the war.
The Australian Army also received approximately 1,700 M3 Grants that had originally been part of a UK order. The Australian Armoured Corps had been formed in 1941 to take part in the North African Campaign, but was retained in Australia after the outbreak of hostilities with Japan. In 1941–42, the cadres of three armoured divisions were formed – all of them were equipped partly with the M3 Grant – in addition to M3 Stuart light tanks. In April and May 1942, the 1st Armoured Division's regiments began re-equipping with M3 Grants and completed their training in a series of large exercises around Narrabri, New South Wales. The 2nd and 3rd Armoured Divisions were officially formed in 1942 and were also partly equipped with M3 Grants. In January 1943, the main body of the 1st Armoured Division was deployed to home defence duties between Perth and Geraldton, Western Australia, where it formed part of III Corps. However, the Grants were deemed unsuitable for combat duties overseas and M3 units were re-equipped with the Matilda II before being deployed to the New Guinea and Borneo Campaigns. Due to personnel shortages, all three divisions were officially disbanded during 1943 and downgraded to brigade- and battalion-level units.
During the battle for Tarawa island in 1943, the US Army attacked nearby Makin Island, which was considered a less costly operation. The army was supported by a platoon of M3A5 Lee medium tanks from the US Army's 193rd Tank Battalion, making this battle the only combat use of the M3 by America in the Pacific Theater. The US Marine Corps did not use M3 Lees; their light tank battalions were equipped with M3 Stuarts until they were replaced by M4 Shermans in mid 1944.
Post-war use in Australia
Following the end of the war 14 of the Australian Grants were converted to a local self-propelled gun design, the Yeramba, becoming the only SPG ever deployed by the Australian Army. Fitted with a 25-pounder field gun, the Yerambas remained in service with the 22nd Field Regiment, Royal Australian Artillery, until the late 1950s.
Many M3s deemed surplus to Australian Army requirements were acquired by civilian buyers during the 1950s and 1960s for conversion to earthmoving equipment and/or tractors.
Overall, the M3 was able to cope with the battlefield of 1942. Its armor and firepower were the equal or superior to most of the threats it faced, especially in the Pacific. Long-range, high velocity guns were not yet common on German tanks in the African theater. However, the rapid pace of tank development meant that the M3 was very quickly outclassed. By mid-1942, with the introduction of the German Tiger I, the up-gunning of the Panzer IV to a long 75-mm gun, and the first appearance in 1943 of the Panther, along with the availability of large numbers of Shermans, the M3 was withdrawn from service in the European Theater.
British designations in parentheses
- M3 (Lee I/Grant I)
- Riveted hull, high profile turret, gasoline engine. 4,724 built.
- M3A1 (Lee II)
- Cast (rounded) upper hull. 300 built.
- M3A2 (Lee III)
- Welded (sharp edged) hull. Only 12 vehicles produced.
- M3A3 (Lee IV/Lee V)
- Twin GM 6-71 diesel variant of welded hull. Side doors welded shut or eliminated. 322 built.
- M3A4 (Lee VI)
- Stretched riveted hull, 1 x Chrysler A57 Multibank engine, made up of five 4.12 litre displacement, 6-cyl L-head car engines (block upwards) mated to a common crankshaft, displacement 21 litres, 470 hp (350 kW; 480 PS) at 2,700 rpm. Side doors eliminated. 109 built.
- M3A5 (Grant II)
- Twin GM 6-71 diesel variant of riveted hull M3. Although it had the original Lee turret, it was referred by the British as Grant II. 591 built.
- M31 Tank Recovery Vehicle (Grant ARV I)
- Based on M3 chassis, with dummy turret and dummy 75 gun. A 60,000 lb (27,000 kg) winch installed.
- M31B1 Tank Recovery Vehicle
- Based on M3A3.
- M31B2 Tank Recovery Vehicle
- Based on M3A5.
- M33 Prime Mover
- M31 TRV converted to the artillery tractor role, with turret and crane removed. 109 vehicles were converted in 1943-44.
- 105 mm Howitzer Motor Carriage M7 (Priest)
- 105 mm M1/M2 howitzer installed in open superstructure. A gunless version was used as an OP (observation post vehicle)
- 155 mm Gun Motor Carriage M12
- Designed as the T6. A 155 mm howitzer on M3 chassis. 100 built in 1942-1943. M30 Cargo Carrier on same chassis to transport gun crew and ammunition.
- Grant ARV
- Guns removed and replaced with armored recovery vehicle equipment.
- Grant Command
- Fitted with map table and extra radio equipment and having guns removed or replaced with dummies.
- Grant Scorpion III
- 75 mm (3.0 in) gun removed, and fitted with Scorpion III mine flail, few made in early 1943 for use in North Africa.
- Grant Scorpion IV
- Scorpion III with additional motor to increase Scorpion flail power.
- Grant CDL
- From "Canal Defence Light"; 37 mm (1.5 in) turret replaced by one with a powerful searchlight and a machine gun. 355 were also produced by the Americans, who designated it the Shop Tractor T10.
- M3 BARV
- A single M3A5 was converted into a "Beach Armoured Recovery Vehicle".
- Yeramba Self Propelled Gun.
- Australian SP 25 pounder. 13 vehicles built in 1949 on M3A5 chassis in a conversion very similar to the Canadian Sexton.
Designs based on chassis
- Medium Tank M4 Sherman
- Tank Cruiser, Ram - see article for full list of variants
- 105 mm Self Propelled Gun, Priest
- Kangaroo armoured personnel carrier
- 25pdr SP, tracked, Sexton Mark I - Sexton Mark II was on a Grizzly chassis
- M12 Gun Motor Carriage
- British India
- New Zealand
- Soviet Union
- United Kingdom
- United States
- Philippines
- Republic of China used during Burma campaign 1945
- Zaloga p. 16 & 20
- Zaloga (Armored Thunderbolt) p. 20 & 21
- Zaloga, Steven (2008). Armored Thunderbolt, The US Army Sherman in World War II. p. 31. ISBN 978-0-8117-0424-3.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Luck, Hans (2013). Panzer Commander: The Memoirs of Colonel Hans von Luck. Dell. p. Paragraph 6.75.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Hunnicutt p. 44
- Zaloga (Armored Thunderbolt) p. 21
- later 3,500 yards
- Fletcher The Great Tank Scandal p90
- Fletcher p 93
- Zaloga (Armored Thunderbolt) p. 18
- Zaloga (Armored Thunderbolt) p. 19
- Zaloga (Armored Thunderbolt) p. 28, 30, 31
- Zaloga (Armored Thunderbolt) p. 28
- Cappellano, F.; Battistelli, P.P (2012). Italian medium tanks : 1939-45. Oxford: Osprey Publ. pp. 34–38. ISBN 9781849087759.
- Fletcher p. 92 Note: initially there were problems with engine wear and suspension springs.
- БМ-6 Братская могила на шестерых, opoccuu.com (in Russian) <templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Zaloga (Japanese Tanks) back cover & p. 3
- Ewing p. VII
- Zaloga (Armored Thunderbolt) p. 24 & 301
- Zaloga (Armored Thunderbolt) p. 30-31
- Hunnicutt (Sherman) p. 105
- Hunnicutt (Sherman) p. 105
- Hunnicutt (Sherman) p. 105
- Zaloga Armored Thunderbolt p. 31
- Zaloga (Japanese Tanks 1939-45) p. 40
- Hunnicutt (Sherman) p. 105
- Zaloga (Armored Thunderbolt) p. 30-31
- Zach Lambert, 2012, "The Birth, Life and Death of the 1st Australian Armoured Division", Australian Army Journal vol. 9, no. 1, pp. 96–7.
- Ronald Hopkins, 1978, Australian Armour: A History of the Royal Australian Armoured Corps 1927–1972, Puckapunyal, Royal Australian Armoured Corps Tank Museum, pp. 125–130, 326.
- Zaloga Armored Thunderbolt p. 305
- USMC TOEs[page needed]
- Ewing, Steve. Thach Weave, The Life of Jimmie Thach. (2004). Naval Institute Press. ISBN 1-59114-248-2.
- Hunnicutt, R. P. Sherman, A History of the American Medium Tank. 1978; Taurus Enterprises. ISBN 0-89141-080-5.
- Zaloga, Steven. Japanese Tanks 1939-45. 2007; Osprey Publishing. ISBN 978-1-84603-091-8.
- Zaloga, Steven. Armored Thunderbolt, The US Army Sherman in World War II. 2008; Stackpole Books. ISBN 978-0-8117-0424-3.
- Technical manuals
- TM 9-2800, Standard Military Motor Vehicles (Technical manual)
|url=(help), US War Department, 1 September 1943<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- SNL G104 Vol. 1, Medium Tank M3 (Service Parts Catalogue)
|url=(help), US War Department<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- TM 9-750, Medium Tanks M3, M3A1 and M3A2, US War Department, May 9, 1942<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- TM 9-1750, Power Train Unit, Three-Piece Differential Case, For Medium Tanks, M3, M4, and Modifications, US War Department, March 1, 1942<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- TM 9-1750D, Accessories for Wright R975-EC2 engines for medium tanks M3 and M4 (pdf), US War Department, August 12, 1942<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- TM 9-1750E, Guiberson Diesel T1400 Engine, Series 3, for Medium Tanks M3 and M4 (pdf), US War Department, September 25, 1942<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- TM 9-1751, 9-cylinder, Radial, Gasoline Engine (Continental Model R975-C1), US War Department, April 19, 1944<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- USMC D-F Series Tables of Equipment (TOEs), 1942-1944
|Wikimedia Commons has media related to M3 Lee.|
- "U.S. Army's 29 ton tanks packs a 75mm gun" Popular Mechanics, July 1941 - one of the first public articles about the M-3
- "Tanks are Mighty Fine Things", 1946 - 145-page book about wartime production of tanks by Chrysler Corporation, including the M3.
- AFV Database (Pictures)
- World War II Vehicles
- OnWar M3, M3A1, M3A3, M3A4
- M3 in the USSR