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81-593: The M3 Stuart / light tank M3, was an American light tank of World War II . An improved version of the tank entered service as the M5 in 1942 to be supplied to British and other Commonwealth forces under lend-lease prior to the entry of the U.S. into the war. Afterwards, it was used by U.S. and Allied forces until the end of the war. The British service name "Stuart" came from the American Civil War Confederate general J. E. B. Stuart and

162-439: A gasoline-fueled 7- cylinder Continental W-670 (8,936 built) or a 9-cylinder Guiberson T-1020 diesel (1,496 built). Both of these powerplants were originally developed as aircraft engines . Internally, the radial engine was at the rear and the transmission at the front of the tank's hull. The driveshaft connecting the engine and transmission ran through the middle of the fighting compartment. The radial engine's crankshaft

243-873: A dozen different uses. The U.S. Army initially deployed 108 Stuart light tanks to the Philippines in September 1941, equipping the U.S. Army's 194th and 192nd Tank Battalions . The first U.S. tank versus tank combat to occur in World War II happened on 22 December 1941 during the Philippines campaign (1941–1942) when a platoon of five M3s led by Lieutenant Ben R. Morin engaged the Imperial Japanese Army (IJA) 4th Tank Regiment's Type 95 Ha-Go light tanks north of Damortis. Lt. Morin, with his 37mm cannon locked in recoil maneuvered his M3 off

324-400: A head-on-head armored engagement, the glacis plate is the largest and most obvious target available to an enemy gunner. Sloped armour has two advantages: many projectiles will deflect rather than penetrate; those that attempt to will have to travel on a longer diagonal route through any given thickness of armor than if it were perpendicular to their trajectory. Anti-tank mines that employ

405-477: A large vehicle to carry it. Gun weight is typically the product of caliber and muzzle velocity . Large caliber guns on light tanks often sacrifice muzzle velocity in interest of saving weight. These guns are effective against close-quarter targets but lack the power and/or accuracy to effectively engage heavier vehicles at a distance. Some light tanks such as the PT-76 are amphibious , typically being propelled in

486-602: A light tank themselves but a developed version of the Carden Loyd tankette as the starting point for a series of British light tanks intended for use in imperial policing and expeditionary warfare. As the only tank fit for immediate manufacture, it was a key element in the expansion of the British Army in the period leading up to the outbreak of war. In general, French tanks of the 1930s were well-armored, innovative vehicles that owed little to foreign designs. However,

567-590: A limited range, which was a severe problem in the highly mobile desert warfare as units often outpaced their supplies and were stranded when they ran out of fuel. On the positive side, crews liked its relatively high speed and mechanical reliability, especially compared to the Crusader tank , which comprised a large portion of the British tank force in Africa up until 1942. The Crusader had similar armament and armor to

648-542: A maximum effective range of about 700 meters. However, this conflict would be instrumental in developing the famous T-34 medium tank. Germany's armored Panzer force was not especially impressive at the start of the war. In the invasions of Poland and France , the German forces were mostly made up of the Panzer I and Panzer II light tanks. The Panzer I was little more than a training vehicle armed only with machine guns;

729-456: A poor range characteristic, especially sensitive for use as a reconnaissance vehicle. In the letter sent to Franklin Roosevelt (18 July 1942), Stalin wrote: "I consider it my duty to warn you that, according to our experts at the front, U.S. tanks catch fire very easily when hit from behind or from the side by anti-tank rifle bullets. The reason is that the high-grade gasoline used forms inside

810-461: A pure light tank. In World War I , industrial initiative also led to swift advances. The car industry, already used to vehicle mass production and having much more experience in vehicle layout, designed the first practical light tanks in 1916, a class largely neglected by the British. Renault 's small tank design, the FT , was the first tank to incorporate a top-mounted turret with a full rotation. The FT

891-712: A significant role in the First Kashmir War (1947) between India and Pakistan, including the battle of Zoji-la pass fought at an elevation of nearly 12,000 ft (3,700 m). M3A1 and M3A3s were used by British forces in Indonesia during the Indonesian National Revolution , where they suffered heavy losses due to the Stuart's thin armor plating. They were used until 1946, when the British left. The M3A1 and M3A3s were then passed on to

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972-576: Is a specialized light tank –amphibious with sufficient firepower to engage other reconnaissance vehicles, but very lightly armored. The US fielded small numbers of the M41 Walker Bulldog with a high velocity 76mm gun, and better armor, but it suffered from range limits, and its weight was too heavy for most air transport of the day. The US M551 Sheridan had similar strengths and weaknesses, but could also be airdropped, either by parachute or LAPES . The French had their AMX-13 light tank, which

1053-418: 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 is any slope, natural or artificial, which fulfils the above requirements. The etymology of this French word suggests a slope made dangerous with ice, hence the relationship with glacier . A glacis plate

1134-649: Is the sloped front-most section of the hull of a tank or other armoured fighting vehicle . A glacis could also appear in ancient fortresses, such as the one the ancient Egyptians built at Semna in Nubia . Here it was used by them to prevent enemy siege engines from weakening defensive walls . Hillforts in Britain started to incorporate glacis around 350 BC. Those at Maiden Castle , Dorset were 25 metres (82 ft) high. Glacises, also called taluses , were incorporated into medieval fortifications to strengthen

1215-419: Is to be of very much use. In spite of the fact that the training of this Battalion was not pointed toward reconnaissance lines, we have been able to accomplish our missions with a Cavalry Reconnaissance Group with a much greater degree of success than in any other assignment to date. British and other Commonwealth armies were the first to use the light tank M3, as the "Stuart", in combat. From mid-November 1941 to

1296-614: The M4 Sherman ) featured a redesigned hull with a raised rear deck over the engine compartment, sloped glacis plate and driver's hatches moved to the top. Although the main criticism from units using the Stuarts was that it lacked firepower, the improved M5 series kept the same 37 mm gun. The M5 gradually replaced the M3 in production from 1942 and, after the M7 project proved unsatisfactory,

1377-854: The Royal Netherlands East Indies Army , which used them until the end of the fighting before passing on the tanks to the Indonesian Army . The tank saw action during the Darul Islam rebellions in Aceh and Java, Republic of South Maluku rebellions in South Maluku, PRRI rebellions in Sumatra, Permesta rebellions in Northern Sulawesi and the fighting against the 30 September Movement . During

1458-700: The "Stuart Kangaroo ", and some were converted into command vehicles and known as "Stuart Command". M3s, M3A3s, and M5s continued in British service until the end of the war, but British units had a smaller proportion of these light tanks than U.S. units. The other major Lend-Lease recipient of the M3, the Soviet Union , was less happy with the tank, considering it under-gunned, under-armored, likely to catch fire, and too sensitive to fuel quality. The M3's radial aircraft engine required high-octane fuel, which complicated Soviet logistics as most of their tanks used diesel or low-octane fuel. High fuel consumption led to

1539-442: The 1927th Cavalry Battalion commanded by Cavalry Major João Mendes Paulo, stationed at Nambuangongo . The vehicles were mostly employed for convoy escort and recovery duties and limited counterinsurgency operations against National Liberation Front of Angola (FNLA) guerrillas, who dubbed them "Elefante Dundum". "Milocas" was destroyed by an accidental fire in 1969, while "Gina" and "Licas" were withdrawn from active service in 1972,

1620-535: The 1944 Liri Valley campaign, the official history of the 18th Battalion (New Zealand) notes that in the campaign (a war of movement) the regiment discovered that the Stuart recce tanks were an enormous advance on scout cars, and could go where not even jeeps could go. They carried commanders and engineers, and medical orderlies, and they could explore flanks while the Shermans forged ahead. They carried mobile wireless links and transported supplies up hilltops; they had

1701-611: The 1960s and 1970s, the Portuguese Army also used a small number of M5A1 light tanks, out of a total of 90 received as military aid from Canada in 1956, in the war in Angola , where its all-terrain capability (compared to wheeled vehicles) was greatly appreciated. In 1967, the Portuguese Army deployed three M5A1 light tanks – nicknamed "Milocas", "Licas", and "Gina" by their crews – to northern Angola , which served with

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1782-548: The British Army. In 1945, obsolete as tanks, many were modified to carry specialized armament: Current operators Former operators Notes Background: British armoured fighting vehicle production during World War II , Tanks in the British Army Light tank The fast light tank was a major feature of the pre– World War II army buildup, where it was expected they would be used to exploit breakthroughs in enemy lines created by slower, heavier tanks, with

1863-586: The British firm of Vickers-Armstrong started promoting another design by John Carden and Vivien Loyd as the " six-ton tank ". Although rejected by the British Army, it was bought by a large number of nations in small numbers. It formed the basis of the Soviet T-26 (around 10,000 built) and the Polish 7TP tank and influenced the Italian Fiat M11/39 . The British Army did not use the design as

1944-606: The Cold War era was the Swedish Ikv 91 (classified as an assault gun by Sweden). It had a low-pressure 90mm gun, strong armor against 20mm grenades, and it was fully amphibious. Light tanks, such as the PT-76 , continue to play a small role in tank warfare , although many are losing favor to cheaper, faster, and lighter armored cars . The light tank still fills an important niche in many armies, especially for nations with airborne divisions, Marine Infantry, or those without

2025-410: The German tanks or SP guns". After the war, some countries chose to equip their armies with cheap and reliable war surplus Stuarts. The Chinese Nationalist Army having suffered great attrition as a result of the ensuing civil war, rebuilt their armored forces by acquiring surplus vehicles left behind in the Philippines by the U.S. forces, including 21 M5A1s to equip two tank companies. The M5 played

2106-523: The German troops who were being left behind the medium tanks. Since many hidden fortifications and positions would have survived the initial medium tank assault, the infantry would then be confronted by any remaining fortified German troops. Behind the infantry came the M5s of a light tank company, who would attack these positions when directed to by the Infantry, usually by the use of green smoke grenades . In

2187-653: The M2 the idler wheel was off the ground and did not aid in suspension. To relieve wartime demand for the radial aero-engines used in the M3, a new version was developed using twin Cadillac V8 automobile engines and twin Hydra-Matic transmissions operating through a transfer case . This version of the tank was quieter, cooler and roomier; the automatic transmission also simplified crew training. The new model (initially called M4 but redesignated M5 to avoid confusion with

2268-643: The M2 with better armor. The new medium tank just entering production in 1940 was the M2A1. This was a poor design with thin armor and a high silhouette. The M3 Stuart saw use in the North African Campaign but was relegated to reconnaissance as soon as US-built medium tanks became available. Further light tank development in the war led to the improved M5 Stuart and then included the M24 Chaffee . Light tanks were issued to tank battalions (one of

2349-531: The M2A4, the M3 was initially armed with a 37 mm M5 gun and five .30-06 Browning M1919A4 machine guns: one coaxial with the main gun, one on top of the turret in an M20 anti-aircraft mount, another in a ball mount in right bow, and two more in the right and left hull sponsons . Later, the main gun was replaced with the slightly longer M6, and the sponson machine guns were removed. The M3 and M3A1 variants were powered by an air-cooled radial engine , either

2430-517: The M3 Stuart as the main battle tank. El Salvador captured eight major cities before the Organization of American States arranged a ceasefire. The South African Armoured Corps continued to use M3A1s in a reserve role until 1955. Some were refurbished locally in 1962 and remained in service as late as 1964. The fleet was withdrawn in 1968, owing to parts shortage. The M3 Stuart is still on

2511-562: The M4's 75mm gun, which fired a much larger shell with a heavier explosive payload. When the U.S. Army joined the North African Campaign in late 1942, Stuart units still formed a large part of its armor strength. After the disastrous Battle of Kasserine Pass , the U.S. quickly followed the British in disbanding most of their light tank battalions and reorganizing medium tank battalions to include one company of light tanks, where

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2592-509: The Panzer II with a 20 mm cannon. The Panzer division also included some Czech designed light tanks—the Panzer 35(t) and the Panzer 38(t) . American light tank development started with the M2 light tank series. These light tanks were mechanically very reliable, with good mobility. However, they had a high silhouette, and only a few saw combat. The M3 Stuart series was an improvement of

2673-584: The Soviets turned down an American offer to supply the M5. M3s continued in Red Army service at least until 1944. One of the more successful uses of the M5 in combat came during the Battle of Anzio when breaking through German forces surrounding the beachhead. The tactics called for an initial breakthrough by a medium tank company to destroy the heavier defenses, followed by an infantry battalion who would attack

2754-488: The Stuart was still effective in combat in the Pacific Theater , as Japanese tanks were both relatively rare and were lighter in armor than even Allied light tanks. Japanese infantrymen were not well equipped with anti-tank weapons, and as such had to use close assault tactics. In this environment, the Stuart was only moderately more vulnerable than medium tanks. Though the Stuart was to be completely replaced by

2835-410: The Stuart while being slower, less reliable, and several tons heavier. The Stuart also had the advantage of a gun that could deliver high-explosive shells; HE shells were not available for the 40 mm QF 2-pdr gun mounted by most Crusaders, severely limiting their use against emplaced anti-tank guns or infantry. The main drawback of the Stuart was its low fuel capacity and range; its operational range

2916-405: The Stuarts mostly performed the traditional cavalry missions of scouting and screening; for the rest of the war, most U.S. tank battalions had three companies of M4 Shermans and one company of M3s or M5/M5A1s. In Europe, Allied light tanks were given cavalry and infantry fire support roles since their light main armament was not competitive against heavier enemy armored fighting vehicles. However,

2997-444: The U.S. entered the war in 1941, it began to supply China with AFVs, including M3 Stuarts, and later M4 Sherman medium tanks and M18 Hellcat tank destroyers , which trickled in through Burma. Although the U.S. light tanks had proven effective in jungle warfare, by late 1943, U.S. Marine Corps tank battalions were transitioning from their M3/M5 light tanks to M4 medium tanks, mostly for the much greater high-explosive blast effect of

3078-597: The active list in the Armed Forces of Paraguay , with ten of the tanks being overhauled in 2014 to provide a training capability. The amphibious Landing Vehicle Tracked LVT(A)-1 had a turret that was nearly identical to that of the M3 Stuart. In the 1970s, the Brazilian company Bernardini developed a series of radical Stuart upgrades for the Brazilian Army . Yugoslav partisans received Stuarts from

3159-473: The angle of their guns while firing. Furthermore, the glacis prevents attacking cannon from having a clear shot at the walls of a fortress, as usually these cannot be seen until the glacis is crossed and the ditch, bounded on either side by the smooth, masoned scarp and counterscarp , is reached. The term glacis plate describes the sloped front-most section of the hull of a tank or other armored fighting vehicle, often composed of upper and lower halves. In

3240-518: The armor in contemporary light tanks is modular, sometimes up to three configurations. The flat hull necessary for amphibious light tanks to plane across the surface of the water is not nearly as blast-resistant as the V-shaped hull. It has been suggested that underbelly armor appliqué could be applied after the light tanks come ashore and before they encounter explosive devices. A gun capable of defeating modern tanks at reasonable ranges requires

3321-416: The development of the main battle tank —in which technological advancements have rendered all previous weight variants obsolete—and has seen use in a variety of roles including the support of light airborne or amphibious forces and reconnaissance. Modified IFVs are assuming these roles in many militaries due to their immediate availability, and as a cheaper versatile alternative to developing and fielding

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3402-686: The end of the year, about 170 Stuarts (in a total force of over 700 tanks) took part in Operation Crusader during the North Africa Campaign , with poor results. This is despite the fact that the M3 was superior or comparable in most regards to most of the tanks used by the Axis forces. The most numerous German tank, the Panzer III Ausf G, had nearly identical armor and speed to the M3, and both tanks' guns could penetrate

3483-539: The fact that light tank platoons were not expected to function as a reconnaissance unit, they could be used for reconnaissance purposes. In this role, they were expected to remain behind the main reconnaissance force as the support element and augment the firepower whenever enemy contact was made. The British withdrew their light tank designs from their armored divisions early in the war, but used some later designs for minor amphibious operations and airborne operations. In general they used armored cars for reconnaissance and

3564-567: The fact that light tank platoons were not expected to function as a reconnaissance unit, they could be used for reconnaissance purposes. In this role, they were expected to remain behind the main reconnaissance force as the support element and augment the firepower whenever enemy contact was made. [It] is apparent that a Light Tank Battalion, armed with only 37mm guns, unless very skillfully employed with Infantry, will suffer severe casualties in men and material. The Light Tank still has to depend on speed, maneuver, and selection of suitable targets if it

3645-464: The few better examples, but the US Army acquired only three Christies and did not pursue the idea any further. Budget limitations and the low priority given to the army meant that there were few resources for building tanks. The US Army instead developed and tested tank components such as suspensions, tracks, and transmissions. This paid off when production had to be initiated on the outbreak of war. At

3726-750: The first American-crewed tanks in World War II to engage the enemy in tank versus tank combat when used in the Philippines in December 1941 against the Japanese. Outside of the Pacific War, in later years of WWII the M3 was used for reconnaissance and screening. Observing events in Europe and Asia during World War II , American tank designers realized that the light tank M2 was becoming obsolete and set about improving it. The upgraded design, with thicker armor , modified suspension and new gun recoil system

3807-561: The former being sent to Luanda and the latter ended up in 1973 as an airfield security pillbox in the Portuguese Air Force 's Zala airfield. Period photographs show some modifications to the basic design, namely the omission of the bow machine gun, re-installed on a pintle mount in the roof of the turret, and a small searchlight fitted in front of the commander's cupola. During the four-day long Football War of 1969, El Salvador invaded Honduras in an all-out-war strike using

3888-778: The four companies was a light tank company), light tank battalions and cavalry reconnaissance squadrons. The original role of the light tank in these formations was similar to medium tanks and they were expected to engage enemy armor with AP rounds and enemy positions with HE rounds. As a result, tank gunnery training for light and medium tankers was common. US Army Field Manuals written before 1944 clearly show that light tanks were to be part of an armored assault on enemy positions, and examples of fire on enemy armor were in these manuals. When pursuing an enemy, Light Tank Battalions were expected to move parallel with enemy columns and, together with accompanying infantry and engineer units, seize "critical terrain that will block hostile retreat". Despite

3969-422: The goal of disrupting communications and supply lines. Numerous small tank designs and " tankettes " were developed during this period and known under a variety of names, including the " combat car ". Early light tank designs were generally better armed and armored than armored cars , but used tracks in order to provide better cross-country mobility. The light tank has been one of the few tank variants to survive

4050-481: The hatch. Some light tanks, such as the M551 Sheridan , ZTQ-15 and 2S25 Sprut-SD armored reconnaissance vehicle, could be rigged for low- velocity airdrops from transport aircraft . With this method the tank is pulled out of the aircraft by brake chutes and skids to a stop. The crew does not ride in the tank during extraction, but parachutes from another plane. Upon landing, they go to their tank, release

4131-546: The last of the light tank designs, the light tank Mk VIII "Harry Hopkins", was produced only in small numbers. The Japanese made extensive use of light tanks that were much better suited to jungle warfare than larger designs, such as the Type 95 Ha-Go light tank. Light tanks continued to be built, but for very limited roles such as amphibious reconnaissance, support of airborne units , and in rapid-intervention forces that were not expected to face enemy tanks. The Soviet PT-76

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4212-463: The last tank versus tank combat occurring on 7 April 1942. As the Japanese 15th Army was threatening southern Burma toward the end of February 1942, 7th Armoured Brigade of the British Army landed at Rangoon with 114 M-3 Stuarts bearing the green rodent of the "Desert Rats". They supported 17th Indian Division and 1st Burma Division on the retreat until they managed to escape to India in April. Due to

4293-524: The light tanks lacked firepower and almost all French tanks were handicapped by their one-man turrets, even the larger tanks such as the Char B1 , which overworked the commander who, besides directing the vehicle, or even a troop, had to load and aim the turret gun. The lack of radios with the light tanks was not seen as a major drawback, since French doctrine called for slow-paced, deliberate maneuvers in close conformance to plans. The role of small unit leaders

4374-469: The limitations of both the main gun (see below) and armor, the Stuart's intended combat role in Western Europe was changed significantly. Light tank companies were often paired with cavalry reconnaissance units, or else used for guarding or screening, and even used in supply or messenger roles for medium tank units. On 9 December 1944, the 759th Tank Battalion advanced on a hill near Bogheim but

4455-598: The lines, and drive it away. Background: History of the tank , Tank classification , Tanks in World War I Background: History of the tank , Tank classification , interwar period Background: History of the tank , Tank classification , Tanks in the Cold War Background: History of the tank , Tank classification Glacis A glacis ( / ˈ ɡ l eɪ . s ɪ s / , French: [ɡlasi] ) in military engineering

4536-467: The most advanced in the 1930s, extremely fast and mounting high velocity 45 mm cannons. Their only drawback were their petrol engines which caught fire often and easily during the Nomonhan fighting, which lasted from about May through September 1939. The Japanese Type 95 Ha-Go light tank was equipped with a diesel engine , and although mounting a 37 mm cannon, it was a low velocity gun with

4617-629: The naval nature of the Pacific campaign, steel for warship production took precedence over tanks for the IJA, creating by default an IJA light tank that performed admirably in the jungle terrain of the South Pacific. By the same measure, although the US was not hampered by industrial restrictions, the U.S. M3 light tank proved to be an effective armored vehicle for fighting in jungle environments. At least one

4698-486: The newer M24 Chaffee, the number of M3s/M5s produced was so great (over 25,000 including the 75mm HMC M8) that the tank remained in service until the end of the war, and well after. In addition to the U.S, UK and Soviet Union, who were the primary users, it was also used by France (M3A3 and M5A1), China (M3A3s and, immediately post-war, M5A1s) and Josip Broz Tito 's Partisans in Yugoslavia (M3A3s and few M3A1). With

4779-608: The operation had more to do with the better tactics and training of the Afrika Korps than the apparent superiority of German armored fighting vehicles used in the North African campaign, the operation revealed that the M3 had several technical faults. Mentioned in the British complaints were the 37 mm M5 gun and poor internal layout. The two-man turret crew was a significant weakness, and some British units tried to fight with three-man turret crews. The Stuart also had

4860-561: The other tank's front armor from beyond 1,000 m (3,300 ft). The most numerous Italian tank (and second most numerous Axis tank overall), the Fiat M13/40 , was much slower than the Stuart, had slightly weaker armor all around, and could not penetrate the Stuart's front hull or turret armor at 1,000 meters, whereas the Stuart's gun could penetrate any spot on the M13/40. Although the high losses suffered by Stuart-equipped units during

4941-836: The preferred choice for infantry support in Equatorial nations. Post–Cold War light tanks include the Stingray , ZTQ-15 , M8 Armored Gun System and Kaplan MT / Harimau . Light tanks based on infantry fighting vehicles chassis include the CV90 105T, 2S25 Sprut-SD , Tanque Argentino Mediano , ASCOD LT 105 , and Sabrah . The modern light tank supplements the main battle tank in expeditionary roles and situations where all major threats have been neutralized and excessive weight in armor and armament would only hinder mobility and cost more money to operate. They have also been used for reconnaissance and, in some cases, infantry support. Typically,

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5022-475: The resources and funding for main battle tanks . They have important advantages over heavier tanks in Southeast Asia and other nations in the Equatorial region. Their compact dimensions and short-to-nonexistent barrel overhang lets them maneuver through thick rain forests, and their weight reduces the risk of getting stuck in mud, and simplifies recovery of stuck or damaged tanks. This makes the light tank

5103-402: The road, but took a direct hit while doing so, and his tank began to burn. The other four M3s were also hit, but managed to leave the field under their own power. Lt. Morin was wounded, and he and his crew were captured by the enemy. M3s of the 194th and 192nd Tank Battalions continued to skirmish with the 4th Tank Regiment's tanks as they continued their retreat down the Bataan Peninsula, with

5184-407: The same height as the curtain walls and converted into gun platforms. Early modern European fortresses were so constructed as to keep any potential assailant under the fire of the defenders until the last possible moment. On natural, level ground, troops attacking any high work have a degree of shelter from its fire when close up to it; the glacis consists of a slope with a low grade inclined towards

5265-413: The start of World War II, the majority of all of the great powers' tank forces consisted of light designs. The most common were the British Light Tank Mk VI , French Renault R35 , German Panzer I , Italian L3/35 (classified as a light tank by the Royal Italian Army , a tankette by others), Japanese Type 95 Ha-Go light tank , Soviet T-26 , and American M2 light tank . The Soviet BT tanks were

5346-436: The tank a thick layer of highly inflammable fumes. " Also, compared to Soviet tanks, the M3's narrower tracks resulted in a higher ground pressure, getting them more easily stuck in the Rasputitsa muddy conditions of spring and autumn and winter snow conditions on the Eastern Front. In 1943, the Red Army tried out the M5 and decided that the upgraded design was not much better than the M3. Being less desperate than in 1941,

5427-440: The top of the wall. This gave defenders a direct line of sight into the assaulting force, allowing them to efficiently sweep the field with fire from the parapet . Additionally, but secondarily, the bank of earth would shield the walls from being hit directly by cannon fire. Though defenders on high ground already have a direct line of sight, a glacis allows the field of fire to be swept more efficiently by minimizing changes to

5508-463: The walls against undermining, to hamper escalades and so that missiles dropped from the battlements would ricochet off the glacis into attacking forces. Towards the end of the medieval period some castles were modified to make them defensible against cannons. Glacis consisting of earthen slopes faced with stones were placed in front of the curtain walls and bastions (towers) to absorb the impact of cannon shots or to deflect them. Towers were lowered to

5589-402: The war, over 3,700 (mostly in 1918), and was more numerous than all British and German tanks combined. The Carden Loyd tankette and its derivatives were adopted by several nations as small tracked vehicles carrying a machine gun for armament. At a time of limited military budgets, tankettes were relatively cheap and functioned as reconnaissance vehicles and mobile machine gun posts. In 1928,

5670-417: The water by hydrojets or by their tracks. Most amphibious light tanks weigh little and often utilize aluminum armor. Some light tanks require no modifications for river crossings. Crews simply raise the easily accessible cloth sides around the hull, cover the hatches, turn on the bilge pump and shift the transmission to water operations. Often, a fold down trim vane is erected to stop water from flooding into

5751-438: Was called "light tank M3". Production of the vehicle started in March 1941 and continued until October 1943. By the standards of the era for light tanks, the Stuart was fairly heavily armored. It had 38 mm of armor on the upper front hull, 44 mm on the lower front hull, 51 mm on the gun mantlet, 38 mm on the turret sides, 25 mm on the hull sides, and 25 mm on the hull rear. Like its direct predecessor,

5832-588: Was captured in the Philippines. With the IJA's drive toward India within the South-East Asian theatre of World War II , the United Kingdom hastily withdrew their 2nd Royal Tank Regiment and 7th Hussars Stuart tank units (which also contained some M2A4 light tanks ) from North Africa, and deployed them against the Japanese 14th Tank Regiment. By the time the Japanese had been stopped at Imphal , only one British Stuart remained operational. When

5913-527: Was designed for its capability to be quickly air-dropped for use with paratroopers and also able to support lightly armed infantry and perform force-reconnaissance effectively. The British FV101 Scorpion , the fire support variant of the Combat Vehicle Reconnaissance (Tracked) series of vehicles that replaced armored cars in British service, has been described as a light tank and was sold to many smaller nations. Another light tank in

5994-424: Was in many respects the first truly modern tank having a layout that has been followed by almost all designs ever since: driver at the front; main armament in a fully rotating turret on top; engine at the rear. Previous models had been "box tanks", with a single crowded space combining the role of engine room, fighting compartment, ammunition stock and driver's cabin. The FT had the largest production run of any tank of

6075-456: Was only 75 miles (121 km) cross country, roughly half that of the Crusader. In the summer of 1942, the British usually kept Stuarts out of tank-to-tank combat, using them primarily for reconnaissance. The turret was removed from some examples to save weight and improve speed and range. These became known as "Stuart Recce". Some others were converted to armored personnel carriers known as

6156-562: Was positioned high off the hull bottom and contributed to the tank's relatively tall profile. When a revolving turret floor was introduced in the M3 hybrid and M3A1, the crew had less room. A further 3,427 M3A3 variants were built with modified hull (similar to the M5), new turret and the Continental W-670 gasoline engine. In contrast to the M2A4, all M3/M5 series tanks had a trailing rear idler wheel for increased ground contact, whereas on

6237-613: Was similar to medium tanks and they were expected to engage enemy armor with AP rounds and enemy positions with HE rounds. As a result, tank gunnery training for light and medium tankers was common. US Army Field Manuals written before 1944 clearly show that light tanks were to be part of an armored assault on enemy positions, and examples of fire on enemy armor were in these manuals. When pursuing an enemy, light tank battalions were expected to move parallel with enemy columns and, together with accompanying infantry and engineer units, seize "critical terrain that will block hostile retreat". Despite

6318-411: Was subjected to a counter-attack by German forces, including a heavy self-propelled assault gun , which took "over 100 direct hits" at ranges as low as 75 yd (69 m) with "no appreciable damage". In January 1945, a report to General Eisenhower concluded that the Stuart was "obsolete in every respect as a fighting tank" and that it would not "turn the German fire [n]or [would] the 37mm gun damage

6399-425: Was succeeded by the light tank M24 in 1944. Total M5 and M5A1 tank production was 8,884; an additional 1,778 M8 75 mm howitzer motor carriages based on the M5 chassis with an open-top turret were produced. Light tanks were issued to tank battalions (one of the four companies was a light tank company), light tank battalions and cavalry reconnaissance squadrons. The original role of the light tank in these formations

6480-409: Was to execute plans, not to take the initiative in combat. In 1939, a belated effort was made to improve flexibility and increase the number of radios. Throughout the interwar period the US produced only a few hundred tanks. From the end of World War I to 1935, only 15 tanks were produced. Most were derivatives or foreign designs or very poor quality private designs. The Christie designs were among

6561-484: Was used for both the M3 and the derivative M5 light tank. Unofficially, they were also often called "Honeys" by the British, because of their smooth ride. In U.S. use, the tanks were officially known as "light tank M3" and "light tank M5". Stuarts were first used in combat in the North African campaign ; about 170 were used by the British forces in Operation Crusader (18 November – 30 December 1941). Stuarts were

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