Canister shot is a kind of

anti-personnel An anti-personnel weapon is a weapon primarily used to maim or kill infantry and other personnel not behind armor, as opposed to attacking structures or vehicles, or hunting game. The development of defensive fortification and combat vehicles gav ...

artillery

ammunition Ammunition, also known as ammo, is the material fired, scattered, dropped, or detonated from any weapon or weapon system. The term includes both expendable weapons (e.g., bombs, missiles, grenades, land mines), and the component parts of oth ...

. It has been used since the advent of gunpowder-firing artillery in Western armies, and saw particularly frequent use on land and at sea in the various wars of the 18th and 19th century. Canister is still used today in modern artillery.

Description

Canister shot consists of a closed metal cylinder typically loosely filled with round

lead Lead () is a chemical element; it has Chemical symbol, symbol Pb (from Latin ) and atomic number 82. It is a Heavy metal (elements), heavy metal that is density, denser than most common materials. Lead is Mohs scale, soft and Ductility, malleabl ...

iron Iron is a chemical element; it has symbol Fe () and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, forming much of Earth's o ...

balls packed with sawdust to add more solidity and cohesion to the mass and to prevent the balls from crowding each other when the round was fired. The canister itself was usually made of

tin Tin is a chemical element; it has symbol Sn () and atomic number 50. A silvery-colored metal, tin is soft enough to be cut with little force, and a bar of tin can be bent by hand with little effort. When bent, a bar of tin makes a sound, the ...

, often dipped in a lacquer of

beeswax Bee hive wax complex Beeswax (also known as cera alba) is a natural wax produced by honey bees of the genus ''Apis''. The wax is formed into scales by eight wax-producing glands in the abdominal segments of worker bees, which discard it in o ...

diluted with

turpentine Turpentine (which is also called spirit of turpentine, oil of turpentine, terebenthine, terebenthene, terebinthine and, colloquially, turps) is a fluid obtainable by the distillation of resin harvested from living trees, mainly pines. Principall ...

to prevent

corrosion Corrosion is a natural process that converts a refined metal into a more chemically stable oxide. It is the gradual deterioration of materials (usually a metal) by chemical or electrochemical reaction with their environment. Corrosion engine ...

of the metal. Iron was substituted for tin for larger-caliber guns. The ends of the canister were closed with wooden or metal disks. A cloth cartridge bag containing the round's gunpowder used to fire the canister from the gun barrel could be attached to the back of the metal canister for smaller

caliber In guns, particularly firearms, but not #As a measurement of length, artillery, where a different definition may apply, caliber (or calibre; sometimes abbreviated as "cal") is the specified nominal internal diameter of the gun barrel Gauge ( ...

cannon. A sabot of wood, metal, or similar material was sometimes used to help the round during firing from the cannon. Various types of canister were devised for specific models of artillery field pieces. In 1753, the " secret howitzer", a special gun with an oval bore—intended to spread shot even wider—was briefly introduced into Russian service, but ultimately proved unsuccessful. The Royal Artillery Museum at Woolwich, London, holds examples of two early 18th century experimental French wide bore cannon—flattened tubes intended to scatter canister wide but in one horizontal plane. The

United States Army The United States Army (USA) is the primary Land warfare, land service branch of the United States Department of Defense. It is designated as the Army of the United States in the United States Constitution.Article II, section 2, clause 1 of th ...

developed a canister round, the M1028, for the

M1 Abrams The M1 Abrams () is a third-generation American main battle tank designed by Chrysler Defense (now General Dynamics Land Systems) and named for General Creighton Abrams. Conceived for modern armored ground warfare, it is one of the heavies ...

' 120 mm smoothbore gun in time for the 2003 invasion of Iraq. The effect is to turn a large-caliber gun on an armored fighting vehicle into a giant

shotgun A shotgun (also known as a scattergun, peppergun, or historically as a fowling piece) is a long gun, long-barreled firearm designed to shoot a straight-walled cartridge (firearms), cartridge known as a shotshell, which discharges numerous small ...

. This can be used against enemy infantry even when in proximity to friendly armoured vehicles, as the projectiles do not penetrate armour. In addition it can be used to create entry points to buildings, reduce wire obstacles and clear heavy vegetation, as well as strike low flying aircraft and helicopters.

Langrage

At times when the supply of balls were limited, nails, scrap iron or lead, wire, and other similar metal objects were included. The projectile had been known since at least the 16th century and was known by various nicknames in the 17th century such as hailshot or partridge shot. Rounds recovered from Henry VIII's warship ''

Mary Rose The ''Mary Rose'' was a carrack in the English Tudor navy of Henry VIII of England, King Henry VIII. She was launched in 1511 and served for 34 years in several wars against France, Scotland, and Brittany. After being substantially rebuilt in ...

'' (sunk 1545) were wooden cylinders filled with broken flint flakes. When filled with rubbish or scrap (rather than round bullets) the round could be known as scrapshot or langrage. In 1718

Blackbeard Edward Teach (or Thatch; – 22 November 1718), better known as Blackbeard, was an English pirate who operated around the West Indies and the eastern coast of Britain's North American colonies. Little is known about his early life, but he ma ...

armed his guns with a range of makeshift weaponry including langrage. Several of his cannons, still loaded with spikes and shot, have been recovered from the wreck site of his flagship, the ''

Queen Anne's Revenge ''Queen Anne's Revenge'' was an early-18th-century ship, most famously used as a flagship by Edward Teach, better known by his nickname Blackbeard. The date and place of the ship's construction are uncertain, and there is no record of its action ...

''. Archaeologists have also retrieved conglomerations of lead shot, nails, spikes and glass from the site. Langrage was also found among the artifact assemblage of the ''Mardi Gras'' shipwreck, 4000 ft (1219 m) deep in the

Gulf of Mexico The Gulf of Mexico () is an oceanic basin and a marginal sea of the Atlantic Ocean, mostly surrounded by the North American continent. It is bounded on the northeast, north, and northwest by the Gulf Coast of the United States; on the southw ...

Effectiveness

When fired, the canister disintegrates and its shards and projectiles spread out in a conical formation, causing a wide swath of destruction. It was particularly effective during the

Napoleonic Wars {{Infobox military conflict , conflict = Napoleonic Wars , partof = the French Revolutionary and Napoleonic Wars , image = Napoleonic Wars (revision).jpg , caption = Left to right, top to bottom:Battl ...

and the

American Civil War The American Civil War (April 12, 1861May 26, 1865; also known by Names of the American Civil War, other names) was a civil war in the United States between the Union (American Civil War), Union ("the North") and the Confederate States of A ...

, where massed troops at close range (usually less than 400 yards) could be broken up by artillery batteries firing canister. At times, particularly at very close range, artillery crews would fire extremely lethal "double canister," where two rounds were loaded into the gun tube and fired simultaneously using a single charge. At the Battle of Waterloo, in 1815, Mercer's Troop,

Royal Horse Artillery The Royal Horse Artillery (RHA) was formed in 1793 as a distinct arm of the Royal Regiment of Artillery (commonly termed Royal Artillery) to provide horse artillery support to the cavalry units of the British Army. Although the cavalry link rem ...

, fired a roundshot and a canister from each gun as a double-shot. The roundshot was loaded first with the canister on top. Canister played a key role for Union forces during their defeat of Confederate troops in

Pickett's Charge Pickett's Charge was an infantry assault on July 3, 1863, during the Battle of Gettysburg. It was ordered by Confederate General Robert E. Lee as part of his plan to break through Union lines and achieve a decisive victory in the North. T ...

during the

Battle of Gettysburg The Battle of Gettysburg () was a three-day battle in the American Civil War, which was fought between the Union and Confederate armies between July 1 and July 3, 1863, in and around Gettysburg, Pennsylvania. The battle, won by the Union, ...

in July 1863. In 1864 at the Battle of Brice's Cross Roads the Confederates used this method. At times, trained artillerists would fire the canister shot towards the ground in front of advancing enemy troops, causing the conical pattern to flatten out as the balls ricocheted and skipped off the terrain. This in effect widened the killing zone. An example of this tactic was on the first day of Gettysburg, where Lt. James Stewart's Battery B, 4th U.S. Artillery on Seminary Ridge skipped canister shot at Alfred M. Scales's approaching Confederate

infantry Infantry, or infantryman are a type of soldier who specialize in ground combat, typically fighting dismounted. Historically the term was used to describe foot soldiers, i.e. those who march and fight on foot. In modern usage, the term broadl ...

, breaking up their attack and forcing them to take cover in a depression. Canister shot was also used to good effect by U.S. Marine 37 mm anti-tank guns in

World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...

to break up Japanese

banzai charge Banzai charge or Banzai attack () is the term that was used by the Allied forces of World War II to refer to Japanese human wave attacks and swarming staged by infantry units. This term came from the Japanese battle cry , and was shortened to ...

s. During the Korean War United Nations tanks experienced close-range massed infantry attacks from Communist forces. As a consequence a canister-type tank round was introduced to "sweep" enemy infantry off friendly tanks without harming friendly tank crews, who were behind canister-proof armor. UK weapons known to have fielded a canister round are the 76 mm and 105 mm tank guns and the 120 mm MOBAT and WOMBAT recoilless anti-tank guns.

Similar multi-projectile ammunition

Shrapnel shells—named for the inventor, British artillery officer Henry Shrapnel—were developed from canister during the Napoleonic Wars and were intended to deliver the same canister effect, but at much longer ranges. As a result, its early designation was "spherical case shot". Instead of a tin can filled with metal balls, the shrapnel shells carry a small powder charge to break open the case and disperse the shrapnel. Grapeshot was a geometric arrangement of round shot packed tightly into a canvas bag and separated from the gunpowder charge by a metal disk of full bore diameter. Grapeshot used fewer but larger projectiles than were contained within canister or shrapnel shells. Case shot broadly describes any multi-projectile artillery ammunition. The canister round is known as a case, so canister was sometimes called case shot and the term has confusingly become generic for grapeshot and shrapnel shells. However, the term case shot is also used to describe a hollow ball containing a powder charge and bullets. After firing the iron ball the powder would explode, scattering the bullets.

References

* Cole, Philip M., ''Civil War Artillery at Gettysburg'', Da Capo Press, 2002, .

External links