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The M10 tank destroyer was an American
tank destroyer A tank destroyer, tank hunter, tank killer, or self-propelled anti-tank gun is a type of armoured fighting vehicle, armed with a direct fire artillery gun or missile launcher, designed specifically to engage and destroy enemy tanks, often ...
of
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the World War II by country, vast majority of the world's countries—including all of the great power ...
. After US entry into World War II and the formation of the Tank Destroyer Force, a suitable vehicle was needed to equip the new battalions. By November 1941, the Army requested a vehicle with a gun in a fully rotating turret after other interim models were criticized for being too poorly designed. The prototype of the M10 was conceived in early 1942 and delivered in April that year. After appropriate changes to the hull and turret were made, the modified version was selected for production in June 1942 as the 3-inch Gun Motor Carriage M10 (or M10 GMC). It mounted a 3-inch (76.2 mm) gun M7 in a rotating turret on a modified
M4 Sherman } The M4 Sherman, officially Medium Tank, M4, was the most widely used medium tank by the United States and Western Allies in World War II. The M4 Sherman proved to be reliable, relatively cheap to produce, and available in great numbers. It ...
tank (the M4A2 production variant) chassis. An alternate model, the M10A1, which used the M4A3 variant chassis, was also produced. Production of the two models ran from September 1942 to December 1943 and October 1942 to November 1943, respectively. The M10 was numerically the most important U.S. tank destroyer of World War II. It combined thin but sloped armor with the M4's reliable drivetrain and a reasonably potent
anti-tank gun An anti-tank gun is a form of artillery designed to destroy tanks and other armored fighting vehicles, normally from a static defensive position. The development of specialized anti-tank munitions and anti-tank guns was prompted by the appearance ...
mounted in an open-topped turret. Despite its obsolescence in the face of newer German tanks like the
Panther Panther may refer to: Large cats * Pantherinae, the cat subfamily that contains the genera ''Panthera'' and ''Neofelis'' **'' Panthera'', the cat genus that contains tigers, lions, jaguars and leopards. *** Jaguar (''Panthera onca''), found in S ...
and the introduction of more powerful and better-designed types as replacements, the M10 remained in service until the end of the war. During World War II, the primary user of the M10 tank destroyer was the United States, but many were
Lend-Lease Lend-Lease, formally the Lend-Lease Act and introduced as An Act to Promote the Defense of the United States (), was a policy under which the United States supplied the United Kingdom, the Soviet Union and other Allied nations with food, oil, ...
d to the
United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and ...
,
Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by to ...
and
Free French Free France (french: France Libre) was a political entity that claimed to be the legitimate government of France following the dissolution of the Third Republic. Led by French general , Free France was established as a government-in-exile ...
forces. Several dozen were also sent to the
Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen nationa ...
. Post-war, the M10 was given as military surplus to several countries, such as
Belgium Belgium, ; french: Belgique ; german: Belgien officially the Kingdom of Belgium, is a country in Northwestern Europe. The country is bordered by the Netherlands to the north, Germany to the east, Luxembourg to the southeast, France to ...
,
Denmark ) , song = ( en, "King Christian stood by the lofty mast") , song_type = National and royal anthem , image_map = EU-Denmark.svg , map_caption = , subdivision_type = Sovereign state , subdivision_name = Kingdom of Denmark , establish ...
, and the
Netherlands ) , anthem = ( en, "William of Nassau") , image_map = , map_caption = , subdivision_type = Sovereign state , subdivision_name = Kingdom of the Netherlands , established_title = Before independence , established_date = Spanish Netherl ...
, through the Mutual Defense Assistance Act or acquired through other means by countries like
Israel Israel (; he, יִשְׂרָאֵל, ; ar, إِسْرَائِيل, ), officially the State of Israel ( he, מְדִינַת יִשְׂרָאֵל, label=none, translit=Medīnat Yīsrāʾēl; ), is a country in Western Asia. It is situated ...
and the
Republic of China Taiwan, officially the Republic of China (ROC), is a country in East Asia, at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the northeas ...
. The M10 is often referred to by the nickname "Wolverine", an unofficial name that sometimes appeared in wartime
Chrysler Stellantis North America (officially FCA US and formerly Chrysler ()) is one of the " Big Three" automobile manufacturers in the United States, headquartered in Auburn Hills, Michigan. It is the American subsidiary of the multinational automotiv ...
advertising, but that was not used by U.S. troops; the M10 was never officially assigned a nickname or referred to with one when used by American soldiers, who simply called it a "TD" (a nickname for any tank destroyer in general) beyond its formal designation.


Doctrine

U.S. combined arms doctrine on the eve of World War II held that tanks should be designed to fulfill the role of forcing a breakthrough into enemy rear areas. Separate GHQ tank battalions would support infantry in destroying fixed enemy defenses, and armored divisions would then exploit the breakthrough to rush into the enemy's vulnerable rear areas. U.S. tanks were expected to fight any hostile tanks they encountered in their attack, but the mission of destroying massed enemy armored thrusts was assigned to a new branch, the Tank Destroyer Force developed in 1941. Tank destroyer units were meant to counter German
blitzkrieg Blitzkrieg ( , ; from 'lightning' + 'war') is a word used to describe a surprise attack using a rapid, overwhelming force concentration that may consist of armored and motorized or mechanized infantry formations, together with close air ...
tactics. Rather than rely on a "thin cordon" of anti-tank guns which would be defeated by a concentrated attack, the tank destroyer units were to be held as a reserve behind the battleline (at the corps or army level), and were to move quickly to the site of any massed enemy tank breakthrough They would maneuver aggressively and using ambush tactics to destroy enemy tanks; charging or chasing enemy tanks was explicitly prohibited. This led to a requirement for very fast, well-armed vehicles. Though equipped with turrets (unlike most self-propelled anti-tank guns of the day), the typical American design was more heavily gunned, but more lightly armored, and thus more maneuverable, than a contemporary tank. The idea was to use speed and agility as a defense, rather than thick armor, to bring a powerful self-propelled gun into action against enemy tanks. Or more precisely, to use speed to deploy ahead of the attacking enemy, take up camouflaged and protected firing positions on their flanks if possible, and then open fire. If unable to destroy the enemy force or to force them to retreat, then mobility would be used to avoid enemy fire until the TDs could withdraw, preferably to move up and deploy for another ambush. Direct combat in the open against tanks was to be avoided whenever possible.


Development

After the formation of the Tank Destroyer Tactical and Firing Center at Camp Hood,
Texas Texas (, ; Spanish: ''Texas'', ''Tejas'') is a state in the South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2020, it is the second-largest U.S. state by ...
in November 1941, the Army began testing to standardize on a configuration for the new tank destroyer battalions. The Tank Destroyer board began to examine several hundred Ordnance Department prototype proposals for a tank destroyer mounting a 3-inch gun, initially focusing the most interest on two: * The T1, developed beginning in 1940 and standardized as the "M5 3-inch Gun Motor Carriage" in January 1941. It was a modified Cleveland Tractor Company airfield towing tractor mounting a 3-inch gun T9 in a limited-traverse mounting * T24, developed beginning in October 1941. It was an
M3 Lee The M3 Lee, officially Medium Tank, M3, was an American medium tank used during World War II. The turret was produced in two forms, one for US needs and one modified to British requirements to place the radio next to the commander. In British C ...
chassis mounting a
3-inch gun M1918 The 3-inch gun M1918 was a United States 3-inch anti-aircraft gun that entered service in 1918 and served until it was largely superseded by the 3-inch anti-aircraft gun M3 in 1930, though the M1918 remained with some National Guard units until ...
in a limited-traverse mounting. The T24 was initially rejected as being too tall and the T40 was its improved derivative. The T40 was standardized as the "M9 3-inch Gun Motor Carriage" for limited production in May 1942 but never built. Meanwhile, as the final design developments of these two tank destroyers were underway, the Ordnance Department became dissatisfied and by November 1941 had issued an additional specification for a tank destroyer with a 3-inch gun in a rotating turret. Design work began immediately. The 3-inch Gun Motor Carriage T35 combined an early-production M4A2 medium tank hull with the 3-inch gun M7 from the
M6 Heavy Tank The Heavy Tank M6 was an American heavy tank designed during World War II. The tank was produced in small numbers and never saw combat. Development Because of limited budgets for tank development in the interwar years, at the outbreak of Worl ...
in a cast, circular, open-topped turret. Using lessons learned from combat reports from the
Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...
, the armor on the sides and rear of the upper hull was changed from flat to sloped plates. This new test vehicle was designated the 3-inch Gun Motor Carriage T35E1. Prototypes of these two vehicles were delivered to Aberdeen Proving Ground in April 1942, and the Army selected the T35E1 for further development on 2 May 1942. The side and rear upper hull armor of the T35E1 was thinned from 1 inch (25.4 mm) to 0.75 inches (19 mm) in order to reduce the weight of the vehicle. The staff at Aberdeen Proving Ground was worried that the armor of the T35E1 was too thin, and so bosses for appliqué armor panels were added to the hull sides,
glacis A glacis (; ) in military engineering is an artificial slope as part of a medieval castle or in early modern fortresses. They may be constructed of earth as a temporary structure or of stone in more permanent structure. More generally, a glacis ...
, and turret sides. As the cast turret was found to be difficult to manufacture, the design of the turret was changed to a sloped pentagonal shape made of welded armor plate. In June 1942, the modified T35E1 was standardized as the 3-inch Gun Motor Carriage M10. By fall 1943, with its M5 and M9 competitors being eliminated from the design competition and their production contracts cancelled, the M10 was to become the United States' primary tank destroyer of the early war period. As there were fears that the production of M4A2 chassis would be inadequate for M10 production, an alternate design, the 3-inch Gun Motor Carriage M10A1 based on the M4A3 medium tank chassis, was also authorized for production.


Design

American tank destroyer doctrine emphasized speed and gun power over armor. As a result, the M10's armor was thin, which made it vulnerable to most German anti-tank weapons. The thickness of the M10's armor ranged from . The lower hull, being modified from that of a standard M4A2 or M4A3 Sherman tank, had armor on the sides and rear, and a floor. The rounded, cast transmission cover was thick. In a departure from its M4 Sherman parent, the M10 lacked the extra -inch floor plate under the driver's and assistant driver's stations that provided them additional protection from mines. The glacis plate was thick, sloped at 55 degrees from the vertical. The sides and rear of the upper hull were thick, sloped at 38 degrees from the vertical. The rear upper hull plate was used for storage of the vehicle's pioneer and maintenance tools: a axe, a crowbar, a mattock handle and head, a double-sided sledgehammer, and a track tensioning wrench. The sides and rear of the upper hull featured angled extensions or covers over the upper run of track. These extensions often got in the way of fitting "duckbill" extended end connectors, used to reduce ground pressure on soft ground, and were often removed, along with the front fenders, by maintenance units. The hull roof plate ranged from thick over the driver's and assistant driver's stations and turret ring, to thick over the engine compartment. The manually rotated turret of the M10 was a pentagonal shape. The sides were sloped 15 degrees inward from the vertical and were thick. The rear of the turret was also 1 inch thick. The partial roof on the front third of the turret opening was thick. The triangular cast gun shield sported the thickest armor on the vehicle, . It was sloped at 45 degrees from the vertical and horizontal. The M10 and M10A1 were mechanically identical except for their power plants. The M10 used the General Motors 6046, a twin engine formed from two Detroit Diesel 6-71 inline engines mated to a single output. The tandem engine produced at 2,100 rpm. One advantage of the GM 6046 was that the engines could be disconnected at will from the output and run independently. If one of the engines was damaged or destroyed, it could be disconnected and the other engine used to move the vehicle. The engine of the M10A1 was the Ford GAA, an 8-cylinder derivative of an ill-fated V-12 aircraft engine project. It produced at 2,600 rpm. When tested side by side in September 1943, the M10A1 was judged to have superior automotive performance to the M10. Even though it produced only slightly less torque, the M10A1's engine was far lighter, and used a common fuel like the rest of the Army's vehicles (gasoline). By the time the test results were released in February 1944, the Army was committed to using the M10 overseas. As a result, the M10A1 was kept in the United States for training. The M10 and M10A1 had a crew of five; commander, gunner, loader, driver, and assistant driver. The driver and assistant driver (who also operated the vehicle's radio) were seated in the front hull and provided with periscopes. The unique design of the hull hatches to clear the gun mantlet meant that the driver's view directly to the left side was obstructed. He was provided with a second periscope at the edge of the hull for this purpose. The commander, gunner, and loader were all located in the turret. The commander sat on a folding seat at the right rear. The gunner, on the left side of the gun, normally stood to operate it, but he was also provided with a folding seat. The loader normally stood in the area behind the gun. A third folding seat was provided in the turret for the assistant driver in case he needed to assist the loader for any reason. Unlike the M4 tanks it was based upon, the M10 lacked an
auxiliary generator A diesel generator (DG) (also known as a diesel Genset) is the combination of a diesel engine with an electric generator (often an alternator) to generate electrical energy. This is a specific case of engine generator. A diesel compression- ...
, which forced the crew to run the main engines in order to recharge the vehicle's batteries. The engine noise and smoke could attract enemy fire, especially in close quarters, where the M10 was vulnerable due to its thin armor and open-topped turret. The lack of an auxiliary generator was rectified with the introduction of the M36 tank destroyer.


Production

Soon after reaching production, it was realized that the barrel of the 3-inch gun M7 was too heavy, to the point where it prevented traverse of the turret on a slope of more than four degrees. As an attempt to improve the figure to fifteen degrees, the Army ordered that the track grousers and antiaircraft machine gun be stored on the rear of the turret. This did not solve the balance problem, and on 21 December 1942, triangular "quick fix" turret counterweights made of lead, mild steel, or cast iron were authorized. The mild steel parts weighed 2,400 pounds. Meanwhile, a set of wedge-shaped counterweights weighing 3,700 pounds total was designed by Fisher. The wedge-shaped weights began to be added to new vehicles at Fisher on 25 January 1943. By late December 1942, a second lock was added to the turret and a stirrup-shaped gun cradle was added to the rear deck to secure the gun for travel. Since the track grousers could not be stored on the rear of the turret anymore, grouser racks that could be attached to the appliqué armor bosses on the hull were added to vehicles beginning in early April 1943. The M10 initially lacked any provision for indirect fire. In May 1943, an azimuth indicator and gunner's quadrant were added to the M10. The grouser racks and indirect fire equipment were often retrofitted to earlier vehicles. By late June 1943, it was realized that Fisher's initial counterweights were too heavy. Two newly designed counterweights reduced the total weight to 2,500 pounds and better distributed the weight of the gun. They resembled an upside-down "duck bill" shape when viewed from the side. To accommodate the new weights, the design of the upper rear of the turret was changed from sloped inwards to nearly vertical. In July 1943, the appliqué armor bosses on the hull sides and turret were dropped from production. The bosses on the glacis were retained. In late September 1943, a single M10 was tested with an Oilgear hydraulic traversing motor that could traverse the turret even without the counterweights, but this modification was not pursued as the production contracts were reaching their end. Production of 4,993 M10s by the
Fisher Body Fisher Body was an automobile coachbuilder founded by the Fisher brothers in 1908 in Detroit, Michigan. A division of General Motors for many years, in 1984 it was dissolved to form other General Motors divisions. Fisher & Company (originally All ...
division of General Motors at the Fisher Tank Arsenal in Grand Blanc,
Michigan Michigan () is a state in the Great Lakes region of the upper Midwestern United States. With a population of nearly 10.12 million and an area of nearly , Michigan is the 10th-largest state by population, the 11th-largest by area, and t ...
ran from September 1942 through December 1943.
Ford Motor Company Ford Motor Company (commonly known as Ford) is an American multinational automobile manufacturer headquartered in Dearborn, Michigan, United States. It was founded by Henry Ford and incorporated on June 16, 1903. The company sells automobi ...
built 1,038 M10A1s from October 1942 until September 1943. From September to November 1943, Fisher built the remaining 375 M10A1s. Fisher also completed a further 300 M10A1 hulls without turrets in January 1944 for direct conversion to
M36 tank destroyer The M36 tank destroyer, formally 90 mm Gun Motor Carriage, M36, was an American tank destroyer used during World War II. The M36 combined the hull of the M10 tank destroyer, which used the M4 Sherman, M4 Sherman's reliable chassis and drivetr ...
s. From January to June 1944, 209 M10A1 vehicles were subsequently converted to M35 Prime Movers by removing the turret and adding the necessary equipment for them to tow the 8-inch Gun M1 and
240 mm Howitzer M1 The 240 mm howitzer M1, popularly nicknamed the "Black Dragon",
''T-Patch 36th Infantry Division News, A ...
1,413 M10A1s, including the 300 hulls manufactured in January 1944, and 724 M10s were eventually converted into M36 tank destroyers.


Armament


Primary

The M10 tank destroyer used an M4A2 medium tank chassis (M10A1s used an M4A3 chassis) with an open-topped manually traversed turret mounting the 3-inch gun M7, in the M5 mount. The M7 gun weighed 1,990 pounds. The gunner stood or sat on the left side of the gun, and aimed it using the M51 or M70G telescope. An M12A4 panoramic telescope was also provided on the right side of the turret for indirect fire use. The M10 carried 54 rounds of 3-inch ammunition, 48 of which were stowed in four racks in the sponsons, and 6 rounds in the upper rear of the turret. For combat use, the 3-inch Gun M7 could fire five types of ammunition: *M79 AP- T shot *M62/M62A1 APCBC/ HE-T shell *M42A1 high explosive shell *M88 HC B1 ( hexachloroethane smoke) shell *T4 (M93) HVAP-T shot The M79 AP shot could penetrate 92 mm of homogeneous armor angled at 30 degrees from the vertical at 1,000 yards. The M62 APCBC/HE-T shell was capable of penetrating 88 mm of homogeneous armor angled 30 degrees from the vertical at 1,000 yards. The rare T4 (M93) HVAP shot that saw action in small numbers beginning in September 1944 was capable of penetrating 135 mm of homogeneous armor angled at 30 degrees from the vertical at 1,000 yards. This shot featured a sub-caliber tungsten carbide penetrator encased within a steel jacket and aluminum body and ballistic "windshield". It was standardized as the M93 in February 1945. By March 1945, about 18,000 rounds of this special ammunition had been delivered to the European Theater, 58 percent of which were 3-inch projectiles. The M42A1 high explosive shell was used for indirect artillery fire or against fortifications and soft targets like infantry in trenches or antitank guns. The M88 hexachloroethane smoke shell was used to create smoke screens, or to flush enemy infantry out of buildings or fortified positions.


Secondary

A
.50 caliber This is a list of firearm cartridges which have bullets in the to caliber range. *''Length'' refers to the cartridge case Case or CASE may refer to: Containers * Case (goods), a package of related merchandise * Cartridge case or casing, a ...
(12.7 mm) Browning M2HB machine gun could be mounted on the top rear of the turret for use against enemy infantry and for
anti-aircraft Anti-aircraft warfare, counter-air or air defence forces is the battlespace response to aerial warfare, defined by NATO as "all measures designed to nullify or reduce the effectiveness of hostile air action".AAP-6 It includes surface based ...
use, along with 300 rounds of ammunition stowed in 50-round boxes under the vehicle subfloor. The crew also had their personal weapons for self-defense. A
Thompson submachine gun The Thompson submachine gun (also known as the "Tommy Gun", "Chicago Typewriter", "Chicago Piano", “Trench Sweeper” or "Trench Broom") is a blowback-operated, air-cooled, Magazine-fed rifle, magazine-fed Selective fire, selective-fire subm ...
with 460 rounds of ammunition was stowed on brackets in the right rear of the turret for use by the vehicle commander. The other four crew members were armed with M1 carbines, each carrying as much ammunition on their person as they saw fit. An M1903 Springfield rifle with 60 rounds of ammunition was stowed next to the assistant driver, and an adapter for the rifle and ten M9 rifle grenades for use against tanks were stowed under the left front vehicle subfloor. Storage boxes in the turret held five Mk 2 grenade, five
M18 smoke grenade The M18 Colored Smoke Grenade is a US Army grenade used as a ground-to-ground or ground-to-air signaling device, a target or landing zone marking device, or a screening device for unit maneuvering. History The M18 was developed in 1942 durin ...
, and two thermite grenades.


Combat use


United States Army

The M10's heavy chassis did not conform to the quickly evolving tank destroyer doctrine of employing very light high-speed vehicles, and starting in the summer of 1944 it began to be supplemented by the fast M18 Hellcat. American tank destroyer doctrine called for tank destroyers to be kept in reserve and rushed forward to counter massed enemy armored attacks. In reality, this was not the case and M10 battalions were attached, often semi-permanently, to infantry and armored divisions to provide additional direct and indirect fire support. Typical missions included providing indirect artillery fire by augmenting divisional artillery units, following and supporting the lead elements of an infantry assault, attacking obstacles such as fortifications and enemy vehicles (including tanks) that hampered the advance of friendly units, and setting up an antitank defense once the objective was secured. The combat debut of the M10 came on 23 March 1943, during the
Battle of El Guettar The Battle of El Guettar was a battle that took place during the Tunisia Campaign of World War II, fought between elements of the Army Group Africa under General Hans-Jürgen von Arnim, along with Italian First Army under General Giovanni M ...
, in the
Tunisian campaign The Tunisian campaign (also known as the Battle of Tunisia) was a series of battles that took place in Tunisia during the North African campaign of the Second World War, between Axis and Allied forces from 17 November 1942 to 13 May 1943. Th ...
part of the larger North African campaign. The M10 was initially successful as its M7 3-inch gun could destroy most German tanks then in service. During the battle, M10s of the 899th Tank Destroyer Battalion and M3 Gun Motor Carriages of the 601st Tank Destroyer Battalion destroyed 30 German tanks, although 20 M3s and 7 M10s were lost. The M10 did not see much anti-tank action for the rest of the North African campaign, and instead was used as mobile fire support. During tank fighting in the Normandy campaign, the M10's 3-inch gun was proven to be ineffective against the thick frontal armor of the German
Panther Panther may refer to: Large cats * Pantherinae, the cat subfamily that contains the genera ''Panthera'' and ''Neofelis'' **'' Panthera'', the cat genus that contains tigers, lions, jaguars and leopards. *** Jaguar (''Panthera onca''), found in S ...
medium tank. On 6 July 1944, Eisenhower's headquarters requested that all M10 battalions be converted to the new M36 as soon as possible. On 10 July 1944, the 899th Tank Destroyer Battalion blunted a German counterattack by the Panzer Lehr Division near Le Dézert and destroyed 12 Panther, one
Panzer IV The ''Panzerkampfwagen'' IV (Pz.Kpfw. IV), commonly known as the ''Panzer'' IV, was a German medium tank developed in the late 1930s and used extensively during the Second World War. Its ordnance inventory designation was Sd.Kfz. 161. The Panz ...
, and one Sturmgeschütz III
assault gun Assault gun (from german: Sturmgeschütz - "storm gun", as in "storming/assaulting") is a type of self-propelled artillery which uses an infantry support gun mounted on a motorized chassis, normally an armored fighting vehicle, which are designed t ...
in a fierce two-day battle, most of it taking place at ranges of less than . Due to the initial shock of encountering heavy German tanks, further changes were made in the tank destroyer force in late September 1944. American officials requested that of the 52 battalions then committed to the European theater, 20 be converted to the M36, 20 retain the M10 or M18 at the discretion of their commanders, and the 12 towed battalions be re-equipped with the (then-prototype) T5 90 mm towed gun. By October 1944, the improved 90 mm Gun Motor Carriage M36 began to arrive in Europe, and mostly replaced the M10 by the end of the war. The plans to retain any towed battalions at all were canceled after their generally poor performance and high losses in 1944, especially during the
Battle of the Bulge The Battle of the Bulge, also known as the Ardennes Offensive, was the last major German offensive campaign on the Western Front during World War II. The battle lasted from 16 December 1944 to 28 January 1945, towards the end of the war in ...
. In the Italian campaign, as in northern Europe, the M10s were normally attached to infantry or armored units as infantry support or mobile artillery, more so the latter because of the general lack of German armor in that theater. Many US divisional commanders asked for their M10s to be replaced with fully armored tanks. In the
Pacific war The Pacific War, sometimes called the Asia–Pacific War, was the theater of World War II that was fought in Asia, the Pacific Ocean, the Indian Ocean, and Oceania. It was geographically the largest theater of the war, including the vas ...
, due to the lack of serious Japanese tank opposition, US Army M10s were not used as tank destroyers, but as mobile artillery and infantry support. The M10 proved unpopular in the Pacific due to its open turret, which left it vulnerable to Japanese close-assault antitank tactics.


British Army

A total of 1,648 M10s were supplied by the United States to the British Army via the
Lend-Lease program Lend-Lease, formally the Lend-Lease Act and introduced as An Act to Promote the Defense of the United States (), was a policy under which the United States supplied the United Kingdom, the Soviet Union and other Allied nations with food, oil, ...
. British M10s were designated as 3inch Self-propelled Mount M10 (3-in SPM M10). The M10 with the "wedge" counterweight was known as the "3in SPM M10 Mk I" and the M10 with the "duck bill" counterweight was designated the "3in SPM M10 Mk II". 1,017 of the vehicles were up-gunned with the powerful 17-pounder (76.2mm) gun from May 1944 to April 1945. The designation used within the Department of Tank Design for both the 3-inch and 17-pounder versions was "Achilles". The 17-pounder conversions were designated various ways, with a "C" suffix added on to the "M10" designation, or called "17pdr M10". Most of the vehicles converted were the 3in SPM M10 Mk II, as the duck bill counterweight better balanced the heavy gun. The gun mantlet needed modification to accept the barrel. The 17-pounder was of a similar bore to the 3-inch gun M7, but had a longer barrel and used a larger propellant charge giving far superior armor penetrating capabilities. The 17pdr SP was used by the British, Canadian and Polish armies in Italy and northwest Europe. As well as service with British forces in Northwest Europe, they were retained post-war. Those not upgunned were stripped of their turrets and used as artillery tractors. In British service, as self-propelled anti-tank guns, the M10 was operated by regiments of the
Royal Artillery The Royal Regiment of Artillery, commonly referred to as the Royal Artillery (RA) and colloquially known as "The Gunners", is one of two regiments that make up the artillery arm of the British Army. The Royal Regiment of Artillery comprises t ...
. Typically, two batteries had M10s while the other two batteries had the towed 17-pounder gun. One tactical theory was that the two towed batteries would form a gun line, while an M10 battery remained mobile on each flank to drive or lead enemy tanks to the static gun line. In practice, UK batteries were frequently separated in Normandy, M10s being seconded to British tank brigades equipped with
Churchill tank The Tank, Infantry, Mk IV (A22) Churchill was a British infantry tank used in the Second World War, best known for its heavy armour, large longitudinal chassis with all-around tracks with multiple bogies, its ability to climb steep slopes, ...
s armed with the general purpose 75 mm gun just as were British 17 pounder conversions.


Free French Army

The Free French received at least 227 M10s, 155 of them through Lend-Lease. They served first in Italy, then in France and Germany. During the
liberation of Paris The liberation of Paris (french: Libération de Paris) was a military battle that took place during World War II from 19 August 1944 until the German garrison surrendered the French capital on 25 August 1944. Paris had been occupied by Nazi Ger ...
in August 1944, a single M10 of General Leclerc's 2nd Armored Division named "Siroco" disabled a
Panther Panther may refer to: Large cats * Pantherinae, the cat subfamily that contains the genera ''Panthera'' and ''Neofelis'' **'' Panthera'', the cat genus that contains tigers, lions, jaguars and leopards. *** Jaguar (''Panthera onca''), found in S ...
in the Place de la Concorde from under the Arc de Triomphe on the Place de L'Etoile, at 1800 m. French M10s also saw action on the French-German border around Strasbourg and in southern Germany; the Free French First Army led by General De Lattre received some when they were a part of the
Sixth United States Army Group The 6th United States Army Group was an Allied Army Group that fought in the European Theater of Operations during World War II. Made up of field armies from both the United States Army and the French Army, it fought in France, Germany, ...
. French M10s were operated along similar lines as US tank destroyer units, although initially with five vehicles per platoon instead of four.


Red Army

Approximately 52 M10s were supplied to the
Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen nationa ...
through Lend-Lease. They were used to form two self-propelled artillery regiments (SPA). The first was the 1223rd Self-propelled Artillery Regiment of the 29th Tank Corps, part of the 5th Guards Tank Army. This unit served on the 3rd Belorussian Front in 1944, taking part in summer campaigns in Belorussia, the Baltic, and East Prussia. The 1239th Self-propelled Artillery Regiment was part of the
16th Tank Corps 16 (sixteen) is the natural number following 15 and preceding 17. 16 is a composite number, and a square number, being 42 = 4 × 4. It is the smallest number with exactly five divisors, its proper divisors being , , and . In English spee ...
, 2nd Tank Army. It fought in Belorussia and Poland in 1944.


Germany

In 1944, during the
Battle of the Bulge The Battle of the Bulge, also known as the Ardennes Offensive, was the last major German offensive campaign on the Western Front during World War II. The battle lasted from 16 December 1944 to 28 January 1945, towards the end of the war in ...
, Operation Greif was a plan developed by the Nazis to infiltrate behind the allies lines. They made various modifications to make approximately ten Panzerkampfwagen 5 "Panther" look as similar as possible to the American M10, known as the Panther M10 or the Ersatz M10 (Ersatz meaning replacement in German).


Israel

Israel bought M10s from scrapyards and dumping grounds in Europe after 1948. The first batch arrived in 1951, being in very bad shape. Some years later, as the M10's guns were worn out, Israel decided to install 17-pounder guns and also French high-velocity 75 mm CN 75-50 guns that had just been bought. The M10s were repaired and entered service in 1955. After the 1956 war, they received the diesel engines of captured Egyptian Sherman tanks. It is believed that Israel also bought M10s from France and may have captured several from Egypt. There is no report that the modified M10s were used by the Israelis in combat. They were withdrawn from service by 1966.


Egypt

The Egyptian Army had a small number of ex-British M10s, 3-inch and 17-pdr versions, and used them in 1948 against Israel. Israel captured some of them.


Combat performance

The M10's open-topped turret left the crew vulnerable to artillery and mortar fire and fragments. The 893rd Tank Destroyer Battalion took many casualties from artillery fire and tree bursts and lost 16 of 24 M10s during the Battle of the Hürtgen Forest. The crew was also exposed to sniper fire and infantry close assault, such as grenades thrown through the open turret, or attacks from upper story-windows, especially in
urban warfare Urban warfare is combat conducted in urban areas such as towns and cities. Urban combat differs from combat in the open at both the operational and the tactical levels. Complicating factors in urban warfare include the presence of civilians a ...
and wooded areas. In UK service, one M10 in the 86th Anti-Tank Regiment (XII Corps) in Normandy drove back out of action three times with the turret crew dead. Two turret crews had been killed by 88mm air bursts or mortars exploding in treetops and one crew was killed by a direct hit through the turret. The same driver survived each time. When this driver was placed with a new crew, his fourth, he was declared to be a 'Jonah' (bad luck) and they refused to drive with him. He was transferred to another unit and told to keep quiet about his history. However, the open-topped turret gave excellent visibility, which was valuable for a vehicle that was tasked with finding enemy armored vehicles and other targets. The open top also made escape easier when the vehicle was hit and improved communications with accompanying infantry. The M10 had a very slow turret rotation speed, as the turret traverse was unpowered and the crew had to use a hand crank to rotate the turret. It took approximately 80 seconds to rotate a full 360 degrees. Total M10 losses in the European Theater of Operations to all causes were 539. Despite not adhering strictly to the tank destroyer doctrine, the M10 still achieved impressive scores against enemy tanks. A US Army study of 39 tank destroyer battalions found that each destroyed, on average, 34 tanks, 17 towed guns, and 16 pillboxes. The tank destroyer battalions in the Third Army claimed the destruction of 686 tanks and 238 self-propelled guns. The highest-scoring tank destroyer battalion in the European Theater, the 823rd Tank Destroyer Battalion, claimed to have destroyed 113 panzers, including 27 Panthers and 18 Tigers, using towed guns and M10s. The 773rd Tank Destroyer Battalion also claimed to have destroyed 113 panzers, with the 702nd Tank Destroyer Battalion claiming 103. The 601st Tank Destroyer Battalion, which fought in North Africa, Italy, and Europe, claimed to have knocked out 155 tanks and self-propelled guns. Tank destroyers in the European Theater fired approximately 11 high-explosive (HE) rounds for every round of
armor-piercing Armour-piercing ammunition (AP) is a type of projectile designed to penetrate either body armour or vehicle armour. From the 1860s to 1950s, a major application of armour-piercing projectiles was to defeat the thick armour carried on many warsh ...
(AP) ammunition, an indication of their use in general support duties in addition to the intended mission of anti-tank defense.


Variants

* 3-inch Gun Motor Carriage T35 (Prototype): M4A2 medium tank chassis * 3-inch Gun Motor Carriage T35E1 (Prototype): Redesign of T35 with thinner sloped armor. Turret design changed and vehicle standardized as M10. * 3-inch Gun Motor Carriage M10 * 3-inch Gun Motor Carriage M10A1: M4A3 medium tank chassis * 3in SPM M10: M10 in British Army service that was equipped with the 3-inch gun M7. ** The M10 with the "wedge" counterweight was designated 3in SPM M10 Mk I ** The M10 with the "duck bill" counterweight was designated 3in SPM M10 Mk II * M10C or 17pdr M10: M10 in British Army service that was equipped with a 76mm Ordnance QF 17 pounder Mark V gun as used on some British tanks. They can be identified by the muzzle brake at the end of the barrel and a counterweight behind the muzzle brake. Post-war the name Achilles has become associated with the 17pdr; contemporary sources referred to it as a "Firefly", not to be confused with post-war use of the name for the 17pdr Sherman tank. * M35 Prime Mover: Turretless M10A1 used as an
artillery tractor An artillery tractor, also referred to as a gun tractor, is a specialized heavy-duty form of tractor unit used to tow artillery pieces of varying weights and calibres. It may be wheeled, tracked, or half-tracked. Traction There are two ...
* 3in SP Ram Mk I: Proposed Canadian-built version using a
Ram tank The Tank, Cruiser, Ram was a cruiser tank designed and built by Canada in the Second World War, based on the U.S. M3 Medium tank chassis. Due to standardization on the American Sherman tank for frontline units, it was used exclusively for tra ...
chassis – a single prototype was built in 1942. * M10 Self-Propelled Howitzer: Demilitarized M10s transferred to the Republic of China in 1949 and rearmed with modified ex-Imperial Japanese Army 105 mm infantry howitzers. Other modifications included a permanent turret roof with crew hatches, lighter and more impact-resistant armor, and a bow machine gun. One prototype and 16 follow-on vehicles were made. * Israeli M10: Israeli Ordnance Corps converted tanks, using 75mm guns received from France. This gun was fitted to a number of M10 tank destroyers.


Users

* * * * * * * * * * * * (Ersatz M10 and captured vehicles) * * * *


See also

* List of U.S. military vehicles by model number * Rhino tank


Vehicles of comparable role, performance and era

* American M36 GMC * British SP 17pdr, A30 (Avenger) * German Hetzer and Sturmgeschütz III * Italian
Semovente da 75/34 The Semovente da 75/34 was an Italian self-propelled gun developed and used during World War II. It was a 75 mm L/34 gun mounted on a M15/42 tank chassis. It saw action during the defence of Rome in 1943 and later served with the Germans in ...
* Romanian Mareșal * Soviet
SU-85 The SU-85 ('' Samokhodnaya ustanovka'' 85) was a Soviet self-propelled gun used during World War II, based on the chassis of the T-34 medium tank. Earlier Soviet self-propelled guns were meant to serve as either assault guns, such as the SU-122 ...
* Soviet SU-100


References


Notes


Citations


Sources

* Doyle, David: ''M10 Tank Destroyer in Action.'' 2015. Squadron/Signal Publications. *Hunnicutt, R.P. ''Sherman: A History of the American Medium Tank.'' 1978. Echo Point Books and Media, LLC. . *Miller, Edward G.: ''A Dark and Bloody Ground: The Hürtgen Forest and the Roer River Dams, 1944–1945.'' 2003. Texas A&M University Press. 978-1585442584 *Yeide, Harry: ''The Tank Killers: A History of America's World War II Tank Destroyer Force''. 2010. Casemate Publishing. * Zaloga, Steven J.: ''M10 and M36 Tank Destroyers 1942–53'' (New Vanguard 57). 2002. Osprey Publishing. *Zaloga, Steven J.: ''M10 Tank Destroyer vs StuG III Assault Gun: Germany 1944'' (Duel 53). 2013. Osprey Publishing. *Zaloga, Steven J.: ''M18 Hellcat Tank Destroyer 1943-97'' (New Vanguard 97). 2004. Osprey Publishing. *Zaloga, Steven J.: ''US Tank and Tank Destroyer Battalions in the ETO 1944-45'' (Battle Orders 10). 2005. Osprey Publishing. * US Army Field Manuals ** FM 18-5 Tactical Employment, Tank Destroyer Unit ** FM 18-5B Organization and Tactics of Tank Destroyer Units ** FM 18-15 Tank Destroyer Drill and Crew Drill: 3-Inch Gun Motor Carriage M10, 76-mm Gun Motor Carriage T70, 3-Inch Towed Gun (Gun M5 and Carriage M1) ** FM 18-20 Tactical Employment of Tank Destroyer Platoon Self-Propelled * US Army Technical Manuals ** TM 9-2800 Standard Military Motor Vehicles ** TM 9-323 – M7 Gun. ** TM 9-731G – Carriage, Motor, 3-inch, M10A1 ** TM 9-752A – Carriage, Motor, 3-inch, M10 ** TM 9-1750 – Power train unit (3-piece differential case) ** TM 9-1750B – Power train unit (1-piece differential case) ** TM 9-1750G – General Motors twin diesel *US Army Supply Catalogue " Standard Nomenclature List" ** SNL G130 – for Carriage, Motor, 3-inch, M10 ** SNL C-43 – M7 gun. *


External links


3" Gun Motor Carriage M10 – AFV Database

M10 3" Gun Motor Carriage – World War II Vehicles
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I Am A Tank Destroyer Commander
large detailed 1943 article
Tankdestroyer.net (Web based United States tank destroyer forces information resource)Flames Of War: Tanks Destroyers
An analysis of the capacities of tanks Destroyers for a wargame {{DEFAULTSORT:M10 Tank Destroyer
Wolverine The wolverine (), (''Gulo gulo''; ''Gulo'' is Latin for " glutton"), also referred to as the glutton, carcajou, or quickhatch (from East Cree, ''kwiihkwahaacheew''), is the largest land-dwelling species of the family Mustelidae. It is a musc ...
M4 Sherman tanks Military vehicles introduced from 1940 to 1944