Grenade
A hand grenade is a small hand-held explosive device designed to be thrown, which then explodes after a short while. The word "grenade" is derived from the Old French (pome) grenate ("pomegranate"), in reference to the general size of early grenades, and because its shrapnel pellets reminded soldiers of the seeds of this fruit. Grenadiers were originally soldiers who specialized in throwing grenades.
Not all grenades are thrown by hand. Several types are fired from rifles or purpose-designed grenade launchers. For example, tear gas grenades used in riot control are fired from riot guns, and the M203 is a grenade launcher that can be fitted to several types of rifles such as the M4 carbine, in which it is underslung beneath the barrel.
History
The first grenade was invented in China during the Song Dynasty (960—1279 AD),known as Zhen Tian Lei when Chinese soldiers packed gunpowder into ceramic and/or metal containers. In 1044, a military book Wujing Zongyao ("Compilation of Military Classics") described various firearms in which one can find the prototype of the modern hand grenade.[2] By 1221, there were the first cast iron bomb-shells and grenades in China, which did not appear in Europe until 1467.[3] Within a couple centuries of this, the Chinese had discovered the explosive potential of packing hollowed cannonball shells with gunpowder. Written later by Jiao Yu in the mid 14th century book of the Huolongjing ("Fire Drake Manual"), this manuscript recorded an earlier Song-era cast iron cannon known as the 'flying-cloud thunderclap eruptor' (fei yun pi-li pao). The manuscript stated that (Wade-Giles spelling):
The shells (phao) are made of cast iron, as large as a bowl and shaped like a ball. Inside they contain half a pound of 'magic' gunpowder (shen huo). They are sent flying towards the enemy camp from an eruptor (mu phao); and when they get there a sound like a thunder-clap is heard, and flashes of light appear. If ten of these shells are fired successfully into the enemy camp, the whole place will be set ablaze...[4]
This text of the Huolongjing was also important for the understanding of the Chinese hand grenade in the 14th century, as it provided much more detailed descriptions and even printed illustrations of the grenade bombs used.[5]
In 1643 it is possible that 'Grenados' were 'thrown amongst the Welsh' at Holt Bridge during the English Civil War.
The use of the word 'grenade' in the English language apparently originated in the Glorious Revolution (1688), where cricket ball-sized iron spheres packed with gunpowder and fitted with slow-burning wicks were first used against the Jacobites in the battles of Killiecrankie and Glen Shiel.[6]
These grenades were not very effective (probably because a direct hit would be necessary for the grenade to have effect) and, as a result, they saw little use.
However, trench warfare favored the grenade. In a letter to his sister, Colonel Hugh Robert Hibbert, described an improvised grenade employed during the Crimea War (1854-1856):
- We have a new invention to annoy our friends in their pits. It consists in filling empty soda water bottles full of powder, old twisted nails and any other sharp or cutting thing we can find at the time, sticking a bit of tow in for a fuse then lighting it and throwing it quickly into our neighbors pit where it bursts, to their great annoyance. You may imagine their rage at seeing a soda water bottle come tumbling into a hole full of men with a little fuse burning away as proud as a real shell exploding and burying itself into soft parts of the flesh.[7]
In World War I (1914-1918) both sides only had small pre-war stocks of grenades. As an interim measure, the troops often improvised their own, such as the Jam Tin Grenade. These were replaced when manufactured versions such as the Mills bomb, the first modern fragmentation grenade, became available to British front-line troops. The Mills bomb was an explosive-filled steel canister with a triggering pin and a distinctive deeply notched surface. This segmentation was thought to aid fragmentation and therefore increase the grenade's deadliness. Later research showed that the segmentation did not improve fragmentation in any way at all. Improved-fragmentation designs would later be made with the notches on the inside, but at the time, this would have been too expensive to produce. The external segmentation of the original Mills bomb was retained, since it did provide a positive grip surface. This basic "pin-and-pineapple" design is still used in some modern grenades. On the other hand, the U.S. M67 fragmentation grenade has a smooth exterior. which is much more suitable for being rolled into a room or being thrown in a flat arc like a baseball.
To throw grenades farther, the rifle grenade was devised. This made use of a modified rifle with a blank cartridge to propel the grenade. These rifles would often be permanently fixed in wooden support frames and would not be used for firing bullets. Use was also made of catapults, both manufactured and improvised, although these were eventually replaced in the trenches by small mortars.
Parallel to the Mills bomb and its similar counterparts, the Germans issued the Stielhandgranate, or stick grenade, which featured an explosive charge encased in a metal can and mounted on a wooden shaft for throwing. This simple design continued to evolve throughout the First and Second World Wars, with the Model 24 grenade (popularly known as the "potato masher") becoming one of the most easily recognized of all small arms, and synonymous with the German soldier.
The Molotov cocktail is an improvised grenade prepared from a glass bottle filled with gasoline (petrol) ignited by a burning strip of cloth when the thrown bottle bursts against its target. The Molotov cocktail received its name during the 1939 Winter War, but had been in use earlier in the decade.
Design
Grenades come in different sizes and shapes, for different purposes. Most are designed to explode, projecting shrapnel, i.e., sharp pieces of the casing, serrated wire, or an incendiary material. Some, like smoke grenades, merely burn, releasing colored smoke for masking, marking ,or signaling. All grenades have two things in common: First, they are hollow so they can be filled with the explosive or chemical filler. Second, they contain a hole into which a fuse can be screwed or inserted.
A grenade is essentially a small bomb, and works very much like a simple firecracker. A firecracker is made up of a paper body filled with flash powder and fitted with a small fuse. Once lit, the fuse burns down to the powder and blows the paper body apart. In modern hand grenades, the fuse is lit by an internal device rather than an external flame.
Characteristics
Hand grenades share the following four characteristics:
- Their employment range is short;
- Their effective casualty radius is small;
- Their delay element permits safe throwing;
- Their hard shell, along with their previously mentioned delay element, enables the grenade to ricochet off hard surfaces, like walls, before detonating.
Hand grenades have the following main parts:
- The body contains the filler and, in some grenades, also provides the fragmentation;
- The filler is the chemical or explosive substance in the grenade, which determines the grenade's use and characteristics;
- The fuse assembly causes the grenade to function by igniting or detonating the filler.
Using grenades
A classic hand grenade has a safety handle or lever (sometimes called by the slang term, "spoon") and a removable safety pin that prevents the handle from being released. In transit, some grenade types also have a safety clip to further prevent the handle from coming off.
To use a grenade the soldier grips it firmly with his throwing hand, ensuring that the safety lever is firmly held in place with the thumb, left-handed soldiers are advised to actually invert the grenade - ensuring that the thumb is still the digit holding the safety lever in place. The pull ring of the safety pin is then grasped with the index or middle finger of the non-throwing hand and the safety pin is removed using a pulling and twisting motion. The grenade is then thrown towards the target, an over-arm throw is recommended but may not be suitable for an actual combat situation. US Soldiers are trained to throw grenades in standing, prone-to-standing, kneeling, prone-to-kneeling, and alternate prone positions and in under- or side-arm throws. If the grenade is thrown from a standing position the thrower must then immediately seek cover or lie prone if no cover is nearby.
Once the grenade is thrown the safety lever is released and the striker throws the safety lever away from the grenade body as it rotates to detonate the primer. The primer explodes and ignites the fuse (sometimes called the delay element), the fuse burns down and activates the detonator which explodes the main charge.
When using an antipersonnel grenade, the objective is to have the grenade explode so that the target is within its effective radius. For the M67 fragmentation grenade used by several NATO nations, the effective kill zone has a five meter radius, while the casualty-inducing radius is approximately fifteen meters.[8] The thrower is warned that fragments can fly as far as 230 meters.
"Cooking off" is a term referring to intentionally holding onto an armed grenade after the pin has been pulled and the handle released, to decrease the amount of time to detonation after throwing. This technique is used to reduce the ability of the enemy to take cover or throw the grenade back. It is also used to allow the grenade to burst in the air over defensive positions.[9] This technique is inherently dangerous, since fuses may occasionally vary from grenade to grenade. Because of this the US Marines (MCWP 3-35) describe cooking-off as the "least preferred technique", recommending a "hard throw, skip/bounce technique" to prevent an enemy returning a grenade.
A call is usually given upon deploying a grenade to warn friendly forces. Some yells, such as "grenade" or "fire in the hole" are used when a grenade has been thrown in by an enemy; in any instance the purpose is to give notice to fellow soldiers to take cover.
In the U.S. Military, when a grenade is dropped into an enclosed space like a tunnel, room, or trench, the person dropping the grenade should yell "fire in the hole" to warn that an explosion is about to occur. Other U.S. military procedures include calling "frag out" to indicate that a fragmentation grenade has been deployed.
Grenades are often used in the field to construct booby-traps, using some action of the intended target (such as opening a door, or starting an auto) to trigger the grenade. These grenade-based booby-traps are simple to construct in the field using readily available materials. The most basic technique involves wedging a grenade in a tight spot so the spoon does not leave the grenade when the pin is pulled. A string is then tied from the head assembly to another stationary object. When a soldier steps on the string, the grenade is pulled out of the narrow passageway, the spoon flies, and the grenade soon detonates.
Abandoned booby-traps and discarded grenades contribute to the increasing problem of unexploded ordnance. The use of tripwire-triggered grenades (along with landmines in general) is banned under the Ottawa Treaty and may be treated as a war crime wherever it is ratified.
The People's Republic of China, the United States, and Russia have not signed the treaty despite large international pressures, citing self-defense needs. The United States is, however, a signatory of the 1996 Protocol on Prohibitions or Restrictions on the Use of Mines, Booby-Traps and Other Devices. The 1996 Protocol restricts use of mines to regions and situations where the mined areas are known, clearly marked, and access is controlled so as to minimize civilian casualties. In signing the 1996 Protocol, the United States made a reservation that 'mines' as defined in the treaty would not apply to booby-trap rigged hand grenades.
Classical "pineapple" grenades, such as the Mills bomb, used smokeless powder and cast-iron shells, which (in theory) would fragment along deliberately-cast weak points in the shell—although the pattern on the grenade body was actually intended to allow the user to have a firm grip on the grenade. In practice, external grooves in the grenade body turned out to have little or no effect on the size and shape of fragments formed. [10]
Grenades have also been made to release smoke, tear gas ("CS"), and other gases, as well as illumination. Special forces often use "flash-bang" grenades to disorient people during an entry into a room, without the intent of causing lasting injury.
Some grenade designs were made to be thrown longer distances. The German "potato-masher" grenade had a long wooden handle that extended its range by fifty percent. The "potato-masher" was fired by a friction igniter in the head, which was activated by a pull string threaded through the hollow stick. Immediately before throwing the grenade, the soldier pulled a small plastic ring attached to a string attached to the friction igniter. This started the time fuse which fired the detonator after a delay. The "potato-masher" is often incorrectly thought to have had an impact fuse. It did not, but the superficially similar British stick grenade design of 1908 did have such a fuse.
Types of hand grenades
Fragmentation grenades
The fragmentation grenade (commonly known as a "frag") is an anti-personnel weapon that is designed to damage or destroy its target with a burst of flying shrapnel. The body is made of hard plastic or steel. Flechettes, notched wire, 3mm ball bearings or the case by itself provide the antipersonnel fragments. When the word "grenade" is used without qualification, and context does not suggest otherwise, it is generally assumed to refer to a fragmentation grenade.
These grenades were sometimes classed as defensive grenades because the effective casualty radius of some matched or exceeded the distance they could be thrown, thus necessitating them being thrown from behind cover. The hand-sized Mills bomb or F1 grenade - both now out of production - are examples of defensive grenades where the 30 – 45 m casualty radius [1] matched or exceeded the 30 m that a grenade could reasonably be thrown.
Modern fragmentation grenades such as the United States "M67 baseball" (nicknamed for its more spherical shape as compared to the Vietnam war era "M61 egg" or World War II era "Mk 2 pineapple") have a wounding radius of 15 m (half that of older style grenades which may still be encountered) and can be thrown about 40 m. Fragments may travel nearly six times this throwing distance. [2]
Concussion grenades
The concussion or overpressure grenade is an anti-personnel device that is designed to damage its target with explosive power alone. Compared to fragmentation grenades, the explosive filler is usually of a greater weight and volume. The case is far thinner and is designed to fragment as little as possible. The shock wave overpressure produced by this grenade when used in enclosed areas is greater than that produced by the fragmentation grenade. Therefore, it is especially effective in enclosed areas.
These grenades are usually classed as offensive weapons because the effective casualty radius is smaller than the distance it can be thrown.
The hand-sized US MK3A2 concussion offensive hand grenade is an example of an offensive grenade. It is filled with TNT and has a body made of tarred cardboard. A more famous example of an offensive grenade is the German Model 24 "potato masher" grenade with a standard tin body.
The term concussion is often erroneously applied to stun grenades. This is not descriptive of the effects caused by the grenade. The term concussion is used because the grenade relies only on its explosive power for its casualty-producing effect.
Percussion grenades
A percussion grenade detonates upon impact with the target. Classic examples of percussion grenades are the British Gammon bomb and No. 69 grenade. Timed fuse grenades are generally preferred to hand-thrown percussion grenades because their fuzing mechanisms are generally safer and more robust than those used in percussion grenades. Some percussion grenades have a conventional pyrotechnic fuse fitted as a backup detonation device.
Smoke grenades
The most common grenades are canister-type grenades. They are used as ground-to-ground or ground-to-air signaling devices, target or landing zone marking devices, and screening devices for unit movements. The body is a sheet-steel cylinder with a few emission holes on top and at the bottom. These allow the smoke to be released when the grenade is ignited. Two main types exist, colored smoke (for signaling) and screening smoke. In colored smoke grenades, the filler consists of 250 to 350 grams of colored smoke mixture (mostly potassium chlorate, lactose and a dye). Red, green, yellow, and violet smoke grenades are available. Screening smoke grenades usually contains HC (hexachloroethane/zinc) smoke mixture or TA (terephthalic acid) smoke mixture. HC smoke is harmful to breathe, since it contains hydrochloric acid. Whilst not intended as a primary effect, these grenades can generate enough heat to scald or burn unprotected skin and the spent casing should not be touched until it can cool down.
Riot control
Contrary to popular belief, gas-expelling grenades are rarely used to disperse large groups, because of the risk of causing generalized panic. Grenades are instead used to create barriers of tear gas in order to direct the movement of large groups of people, or to protect police officers on the verge of being overwhelmed. As an exception, tear gas may be used to disperse a mob surrounding a small centralized group of victims.
Similarly, gas-expelling grenades are not often used to force criminals out of their cover because of the risk of intoxicating people in enclosed areas, although SWAT teams will occasionally employ CS gas grenades to facilitate the arrest of an armed suspect, especially if there are no bystanders in the area. This kind of deployment is used most often in an area where several suspects have a large amount of cover, since the functioning of other distraction grenades will be hindered.
Tear gas grenades are similar to burning smoke grenades in terms of shape and operation. However in tear gas grenades the filler is generally 80 to 120 grams of CS riot control agent combined with a pyrotechnic composition which burns to generate an aerosol of CS-laden smoke. This causes extreme irritation to the eyes and, if inhaled, to the nose and throat. (See also the Branch Davidian siege). Occasionally CR agent is used instead of CS.
Incendiary grenades
Incendiary grenades produce intense heat by means of a chemical reaction. The body is practically the same as that of a smoke grenade. The filler is 600 to 800 grams of thermate (TH3), which is an improved version of the World War II-era thermite. The chemical reaction that produces the heat is called a "thermite reaction." In this reaction, aluminum metal and iron oxide (rust) react to produce iron and aluminum oxide. This reaction produces a tremendous amount of heat, burning at 2200 degrees Celsius (4000 degrees Fahrenheit). A thermite grenade can melt together the metallic parts of an object. This makes incendiary grenades such as the AN-M14 useful for destroying weapons caches, artillery units, and vehicles. Other advantages of thermite include its abilities to burn through a 1/2-inch (12.7 mm) steel plate and to function without an external oxygen source, allowing it to burn underwater.
White phosphorus (also used in smoke grenades; see above) can also be used as an incendiary agent. It burns at a temperature of 2800 °C (5000 °F).
Thermite and white phosphorus cause some of the worst and most painful burn injuries because they burn so quickly and at such a high temperature. A single lit particle can burn through skin, nerves, muscles and even bones. In addition, white phosphorus is very poisonous: a dose of 50-100 milligrams is lethal to the average human.
Stun grenades
Stun grenades, also called NFDDs (Noise and Flash Diversionary Devices), "flash & bang" grenades, flashbangs, flash grenades, or occasionally flashcrashes, were originally designed for the British Special Air Service as an incapacitant. Stun grenades are used to confuse, disorient, or momentarily distract a potential threat for up to five seconds. A "flashbang" can seriously degrade the combat effectiveness of affected personnel for up to a minute. The best known example is the M84 Stun Grenade, commonly known as the "Flashbang", so called because it produces a blinding (6-8 million Candela) flash and deafening (170-180 dB SPL) blast. This grenade can be used to incapacitate people, generally without causing serious injury. Standard operating procedure for LAPD SWAT has officers deploy flashbangs close to the point of entry. This is because all attention will be directed towards the door once it has been breached, and deploying the flashbang close to this point heightens the chances that a suspect will be affected by the device.
The physiological processes through which this is made possible are quite simple. The flash of light momentarily activates all photosensitive cells in the retina, making vision impossible for approximately five seconds until the eye restores the retina to its original, unstimulated state. Subjects affected by flashbangs describe seeing a single frame for the five seconds (as if their vision was "paused") until it fades and normal sight returns. This is because the sensory cells which have been activated continue sending the same information to the brain until they are restored to their resting state, and the brain translates this continuous information into the same image. The incredibly loud blast emitted from the grenade contributes to its incapacitative properties by disturbing the fluid in the semicircular canals of the ear. The semicircular canals consist of three half circles of tubing, each oriented in one of the three planes of motion, that are filled with fluid. The walls of the tubes are lined with hair cells which use their small, hairlike cilia to detect the motion of the fluid. This establishes a person's sense of balance and movement through space. When a flashbang detonates, the fluid in the semicircular canals is disturbed, and with it the subject's sense of balance. The phenomenon is similar to spinning rapidly in one direction, and suddenly stopping. The sensation that the room is moving comes from the movement of the fluid in the inner ear.
Upon detonation, the fuse/grenade body assembly remains intact and produces no fragmentation. The body is a steel hexagonal tube with holes along the sides which allow a blast of light and sound to be emitted. This is done to prevent injury from shrapnel. However, injuries resulting from the concussive properties of the detonation sometimes occur. The filler consists of about 4.5 grams of a pyrotechnic metal-oxidant mix of magnesium and ammonium perchlorate or potassium perchlorate.
Sting grenades
Sting grenades, or Hornet's Nest grenades, are another less-than-lethal grenade that are based on the design of the fragmentation grenade. Instead of using a metal casing to produce shrapnel, however, they are made using two spheres of hard rubber. Inside the smaller sphere is the explosive charge, primer, and detonation pin. The space between the two spheres is then filled with many small, hard rubber balls about 20mm in diameter. Upon detonation, the subject is incapacitated by the blunt force of the projectiles. The advantage to using sting grenades comes from the fact that the subject is very often knocked out, winded, or at the very least dislodged from cover because of the shock. Vision is sometimes also impaired due to minor trauma of the visual cortex located in the back of the head.[citation needed]
Some types have an additional payload of chemical agents like CS gas or pepper spray.[citation needed]
The advantages compared to a flashbang are
- The "plug 'n shut" tactic, which is shutting one's eyes and plugging one's ears to avoid being affected by a flashbang. This does nothing to protect a person from a Hornet's Nest's payload,
- The recipient does not need to be looking at the grenade for it to take its full effect,
- Stingers are much more likely to cause a subject to either fall or lower himself in pain, thus providing good sight lines to unaffected targets in the area
This makes sting grenades ideal for containing small groups of rowdy prisoners, providing a shooting opportunity when a suspect is hiding behind cover, or in allowing SWAT teams to clear small rooms. In many situations, it is preferable to a flashbang.[citation needed]
A disadvantage of using sting grenades is that a sting grenade is not sure to lessen the lethality of a suspect, so it is dangerous to use if the subject is armed. This arises from the fact that sting grenades rely on the body's reaction to adversive stimuli (pain and blunt force trauma) rather than in denial of sensory input. A person with sufficient mental focus can concentrate enough to fire a few shots even after being hit by a sting grenade's payload, whereas a flashbang will physically affect vision and sense of orientation in space.
Also, the effective range of a sting grenade is limited compared to a flashbang.
Impact stun grenades - Blank Firing Impact Grenade or BFIG
A more recent development is the Blank Firing Grenade (BFIG or Blank Firing Impact Grenade). Preferred in many situations, especially training, for two main reasons; they are re-usable - and therefore more economical - because the charge is a standard ammunition blank, and they are subject to very few transport restrictions when unloaded. The BFIG contains a mechanism to fire a blank cartridge when dropped at any angle onto a hard surface from a height of a metre or more. Firing will occur in any combination of positions only on impact. [3]
Anti-tank grenades
The first anti-tank grenades were improvised devices usually made by putting a number of fragmentation grenades into a sandbag or by tying them together. Due to their weight, these were normally thrown from very close range or directly placed in vulnerable spots onto an enemy vehicle.
Purpose-designed anti-tank grenades invariably use the shaped charge principle to penetrate the tank's armor. This means that the grenade has to hit the vehicle at an exact right angle for the effect to work properly. This is achieved by the grenade deploying a small drogue parachute or fabric streamers after being thrown.
The British put the first anti-tank grenade into the field during the Second World War with the rifle-fired No 68 AT Grenade. Also developed by the British during the Second World War, was the No 74 ST Grenade popularly known as a sticky bomb; the main charge was held in a sphere covered in adhesive. In anticipation of a German invasion, it was produced in substantial numbers. Inherently dangerous for the user, it was relegated to Home Guard use.
During World War II, when tanks were overrunning entrenchments anti-tank mines could and were used by infantry as an improvised hand grenades by placing or throwing them in the path of a tank in the hope of disabling a track.
The most widely-distributed anti-tank grenades are the Russian designs of the 1950s and later, mainly the RKG-3.
Due to improvements in modern tank armor, anti-tank hand grenades are generally considered obsolete.
Grenades as ornamentation
Stylized pictures of early grenades, with a flame coming out, are used as ornaments on military uniforms, particularly in France (esp. French Gendarmerie and the French Foreign Legion), and Italy (Carabinieri). The British Grenadier Guards took their name and cap badge of a burning grenade from repelling an attack of French Grenadiers at Waterloo. The branch insignia of the US Army Ordnance Corps also uses this symbol.
Etymology
The word "grenade" originally meant the pomegranate fruit, and was transferred to early explosive grenades whose filling was gunpowder with many small pieces of metal embedded in it.
See also
- Nils Waltersen Aasen, the creator of the modern hand grenade
- Rocket propelled grenade
- Technology of Song Dynasty
- Jiao Yu
Notes
- ^ "The Genius of China", Robert Temple
- ^ Joseph Needham: Science and civilisation in China: Vol. 5; Part 6: Chemistry and chemical technology; Military technology: missiles and sieges, Cambridge University Press 1994, ISBN 0-521-32727-X
- ^ Needham, Volume 5, Part 7, 179.
- ^ Needham, Volume 5, 264.
- ^ Needham, Volume 5, Part 7, 179-180.
- ^ Cramb, Auslan (2004). "Battlefield gives up 1689 hand grenade". Scotland Correspondent.
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ignored (help) - ^ "The National Archives, records of the UK government". Letters of Hibbert, Hugh Robert, 1828-1895, Colonel, ref. DHB/57 - date: 14 Jun. 1855. Retrieved 2006-08-09.
- ^ United States Army Field Manual 3-23.30, Grenades and Pyrotechnic Signals (2005 revision), page 1-6
- ^ United States Army Field Manual 3-23.30, Grenades and Pyrotechnic Signals (2005 revision), pages 3-11 to 3-12
- ^ Hogg, Ian. The Encyclopedia of Infantry Weapons of World War II. Northbrook, IL: Book Value International. p. 159. ISBN 0-89196-099-6.
References
Needham, Joseph (1986). Science and Civilization in China: Volume 5, Part 7. Taipei: Caves Books, Ltd.
External links
- RUAG - manufacturer of modern hand grenades
- Mecar - Belgian manufacturer of various grenade types
- Pakistan Ordnance Factories - licensed manufacturer of Arges grenades
- Film of exploding grenade - taken using ultra high-speed photographic technique (2/3 million frames per second)
- How Grenades Work - from HowStuffWorks
- Exploded view of a modern Arges 73 hand grenade
- Video showing fragmentation grenade effects
- Video #1 of M67 fragmentation grenade
- Video #3 of M67 fragmentation grenade
- Video #4 of M67 fragmentation grenade
- Video of RGD-5 fragmentation grenade
- 90th Infantry Division Preservation Group Article on authentic WW2 pineapple grenades