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EARLY SYSTEMS

Small Cannon and large- Calibre Rifle s were used against the early World War I tanks being introduced by the British Expeditionary Force (BEF), many of which proved to be almost useless. Some weapons included the Armor Piercing 7.92 ''K'' Bullets , then a larger Anti-tank Rifle when those became ineffective. Also grenades were used, and the ''Geballte Ladung'' (‘Bunched Grenade’), basically several regular grenades bound together. Tanks were also vulnerable to artillery and mortars, especially if they became stuck, which was no miracle at the time with difficult terrain and barbed wire, and they could be targeted more easily.

By the end of the war a number of light guns, typically 37 Mm (a 2 Pounder in British measure) were being deployed on short carriages that proved to be considerably better. In addition most forces deployed large high-velocity rifles, typically of .50 cal (12.7 mm) calibre, with enough power to puncture the thin armor of the tanks of the era.

The Soviet Union employed Anti-tank Dog s, although they weren't very successful.


ANTI-TANK GUNS

45 mm anti-tank gun (version 1942 )]]

: ''See also: Tank Gun .''

Anti-tank guns are guns designed to destroy armored vehicles. In order to penetrate the armor of tanks and other armored vehicles they fire high-velocity shells.

Prior to World War II anti-tank guns were relatively small, with Anti-tank Rifle s primarily used for destroying tanks. Few had barrel diameters larger than 50 mm. With the rapid improvement in tank armor and guns anti-tank guns increased in barrel size, firing larger shells at greater velocities. One of the most noteworthy of these weapons was the German 88 mm gun, which was originally developed as an anti-aircraft but found widespread use in destroying tanks. Likewise, by the end of the war all sides were using guns with diameters of 90 mm and up.

37 mm anti-tank gun]]

World War II also saw the mounting of antitank guns on vehicle chassis, sometimes armored, as a cheap substitute for a full-fledged tank. Some had open turrets, while others did not have rotating turrets at all, meaning that the whole vehicle had to be rotated to aim the gun. Americans called these vehicles tank destroyers.
50 mm anti-tank gun]]
At the start of World War II many of these weapons were still being used operationally, along with a newer generation of light guns that closely resembled their WWI counterparts. In combat both proved entirely useless against the larger and better armored tanks they faced. For instance, the German army had recently introduced a new lightweight 37 mm gun, whose users quickly nicknamed it the "armored door knocker" because all it seemed to do was announce its presence.

All combatants quickly introduced newer and more powerful guns, and the anti-tank rifle had largely disappeared by 1942. The "average" gun by 1943 was 50 mm or larger, the Germans had an excellent 50 mm high velocity design, while the British introduced the " 6-pounder " which was also adopted by the US Army as the 57 mm. A year later sizes had grown due to pressure on the Eastern Front , German guns were now 75 mm and the famous 88  mm, while their Soviet counterparts were mounting a variety of 100 mm and 122 mm guns.

As the guns grew in size they dropped in mobility, leading to the development of the Anti-tank Vehicle , typically a tank chassis with a much larger gun mounted on top. By the end of the war the concept of the dedicated anti-tank gun was essentially dead, the guns were so large that they were essentially immobile.


GRENADES


There were many types and kinds of anti-tank grenades. These ranged from hollow charge weapons, to ones that simply contained a lot of explosive. There were also a special type of grenade called ''Nebelhandgranaten'' ("smoke hand grenades") which was supposed to be smashed over an air vent and fill the tank with smoke, widely used by both sides. Molotov Cocktails also saw much use, especially in Winter War , but it was mainly early tanks that were vulnerable to them, and later tanks required a well thrown bottle directly over the engine compartment to have any effect at all.


HEAT

A parallel evolution was taking place at this time however, anti-tank weapons based on HEAT warheads using a Munroe Effect Shaped Charge . These self-forging explosive munitions could penetrate even more armor than some of the largest anti-tank guns, yet weighed only a few pounds. Typically delivered by a small rocket fired at short range, HEAT formed the basis of the British PIAT , US Bazooka and German Panzerfaust , Panzerschreck and the Recoilless Rifle . In many cases these weapons were so effective that the concepts of Blitzkrieg could often be stopped cold by properly equipped troops.

The Germans even used HEAT warheads on their now useless 37 mm guns to deliver the warheads at ranges that the rockets couldn't match. However the effectiveness of a HEAT warhead is strongly related to its diameter, so while HEAT was not too effective on "larger" guns like the 75 and 88, on the 37 this was solved by placing an oversized warhead on the outside of the barrel, popped off in a manner similar to a Rifle Grenade . This ad-hoc solution was used only in desperation, the recoilless rifle offered the same performance from a much lighter breech-loading gun.


POST-WAR DEVELOPMENTS

In the post-WW II era HEAT became almost universal. The British had developed the HESH , or high explosive squash head, warhead as an anti-concrete device for attacking fortifications during the war, and found it surprisingly effective against tanks. Like HEAT its effectiveness was the same at long range as it was at short range. In general these systems allowed infantry to take on even the largest tanks, albeit at short ranges. But the short range of the delivery systems remained a problem. Increasing use of Combined Arms tactics allowed the attacking infantry to suppress the anti-tank crews effectively, meaning that they could typically get off only one or two shots before being countered or forced to move.

The search for a suitable longer-range delivery system took up much of the immediate post-war era. The US invested in the Recoilless Rifle , delivering a widely used 75 mm design, and less-common 90 mm and 106 mm designs (this last one was usually mounted on a jeep rather than hauled across the battlefield by infantrymen). The 106 mm formed the basis of a dedicated anti-tank vehicle, the Ontos Tank , which mounted six. The Russians also built Recoilless Rifle s in various calibers intended to be used as antitank weapons, most commonly 73 mm, 82 mm, and 110 mm (only the 73 mm remains in service with the Russian military today, though the other two can be found all over the world, courtesy of Soviet military aid during the Cold War). The British used a massive 120 mm (4.7 inch) design the BAT Series which served from the 1950s until replaced by MILAN , but it was generally too heavy for infantry use and had to be towed by a vehicle or mounted on one for manuvrability. However most forces, the US included, invested heavily in the development of the Wire Guided Missile as a delivery system, eventually delivering systems in the 1960s that could defeat any known tank at ranges outside that of the guns of the accompanying infantry. The United Kingdom, France, and other NATO countries were among the first to develop such weapons (e.g. the Malkara Missile ). The United States was one of the last, coming up with the BGM-71 TOW , which was more powerful and easier to use than all the previous missiles, and eventually came to be the most widespread wire guided anti-tank weapon in the West.

Of the world's major armies, primarily the Russians, and some other countries retained the antitank gun in significant quantities, mostly in calibers 100 mm, 115 mm, and, currently in Russia, 125 mm. The 125 mm antitank guns are extremely bulky and massive, and require large tractors to tow them for any significant-distance cross-country, but they're relatively cheap, potentially deadly (particularly now that they've been upgraded with laser rangefinders and Depleted Uranium ammunition), though it is not clear what their tactical usefulness is in many types of warfare would actually be. In Desert Storm for example, tanks set up in emplacements were very vulnerable to many weapon systems and could be spotted well in advance. In an environment with more cover they would be harder to spot.

For a time it appeared that the tank was a dead end, a small team of infantry with a few missiles in a well hidden spot could take on a number of the largest and most expensive tanks. In the 1973 Yom Kippur War , Soviet first-generation wire guided missiles being fired by the Egyptian forces inflicted heavy casualties on IDF tank units, a battle that caused a major crisis of confidence for tank designers.


FUTURE ANTI-TANK

As bad as it looked for the tank in the 1960s, increases in depth of armor and improvements in armor technology meant that hand-held systems were no longer large enough to deliver enough power by the 1970s, and the introduction of Chobham Armour by the UK and Reactive Armor by the USSR, forced the HEAT rounds to be so large that in many cases they are no longer truly man-portable.

Today the anti-tank role is filled with a variety of weapons, from portable "top attack" missiles, to larger HEAT based missiles for use from Jeep s and Helicopter s, a variety of high velocity Autocannon , and ever-larger heavy tank guns.