Mortar (weapon)

soldiers firing a mortar.]]
A **mortar** is an artillery weapon which fires explosive shells. The shells are known as (mortar) bombs. They are fired at targets which are close, as mortars do not have long range. It has a short barrel which fires the mortar bomb at a low speed high into the air to reach its target. They have been used since medieval times. Mortars are made in different sizes, from large and heavy mortars to infantry mortars which can be carried by just one soldier. They are called an indirect fire weapon because the bomb drops onto the target from above, rather than being aimed straight at it. Soldiers firing a mortar do not need to be able to see their target.

## Use 
A mortar is quite simple and easy to use. Most are muzzleloaders made up of a tube that a gunner drops a bomb into. The tube is usually set at between 45 and 90 degrees angle to the ground. Some larger mortars have a firing pin that is set off by using a string instead of automatically.

From the 18th to the early 20th century, very heavy siege mortars were used. These were very difficult to move around. These had up to one metre calibre. They were often made of cast iron. Smaller designs that were easier to move around were brought in during the First World War. Mortars are still used today.

 of a French mortar. This is from the 18th century.]]
Light and medium mortars are easy to move around. They are usually used by infantry units. Mortars can fire from a trench or defilade.

Heavy mortars are usually between 120- and 300-mm calibre. These weapons are usually towed or put on to vehicles. They are sometimes loaded from the back (breech-loaded). They are usually used by infantry in battalions or divisions. Even mortars this large are simpler and cheaper than howitzers and field guns.

A mortar can be moved around by one or more people (bigger mortars can usually be broken down into parts) or moved around in a vehicle. An infantry mortar can usually be set up and fired from a mortar-carrier. A mortar-carrier is a modified armoured vehicle or one built especially to be a mortar-carrier. They have a big hatch on the roof. Mortars with two barrels—like the AMOS PT1—are the latest kinds of heavy mortar. They are put on carriers such as armoured personnel carriers, tank chassis and patrol boats.

Light versions of mortar are usually used by at least two men. Heavier mortars are fired by three to five men. The speed of these was said to be very slow. It was also said that men could be prevented from being injured by putting observers out who warned the troops of what angle the mortars were firing at.

Early mortars like the Pumhart von Steyr were big and heavy. They were also difficult to move around.  An early mortar that could be moved easily was invented by Baron Menno van Coehoorn  (Siege of Grave, 1673).  At the Siege of Vicksburg, General Ulysses S. Grant reported making mortars "by taking logs of the toughest wood that could be found, boring them out for six or twelve-pound shells and binding them with strong iron bands.  These answered as coehorns, and shells were successfully thrown from them into the trenches of the enemy."

Mortars were very useful in the muddy trenches of the Western Front. A mortar round could be aimed to fall straight into a trench because of the deep angle that the bombs fell at.

During the Battle of Iwo Jima, the Imperial Japanese Army used twelve 320 mm mortars against the American forces.

### Biggest mortars
The biggest mortars ever made were the French "Monster Mortar" (36 French inches; 975&nbsp;mm; developed by Henri-Joseph Paixhans in 1832), Mallet's Mortar (36&nbsp;inches; 910&nbsp;mm; designed by Robert Mallet and tested by the Woolwich Arsenal, London, in 1857) and the "Little David" (36&nbsp;inches; 914.4&nbsp;mm; developed in the United States for use in World War II). All three mortars had a caliber of 36&nbsp;"inches". However, only the "Monster Mortar" was used (at the Battle of Antwerp in 1832).

### "Home-made" mortars
"Home-made" mortars have been used by insurgent groups. They are usually used to attack well defended military bases or to scare civilians. An early example was the Davidka. This was used during the Israeli War of Independence in 1948. The Provisional Irish Republican Army used some of the best-known examples during the 1970s, 1980s and 1990s. The biggest types came to be known as "barracks busters". They were usually made of heavy steel piping put onto a steel frame.

Well-known events using "home-made" mortars include the 1985 Newry mortar attack. This was when nine members of the Royal Ulster Constabulary were killed. Another well-known event is the Downing Street mortar attack in 1991. In this, the IRA mortared 10 Downing Street during a meeting. Three bombs were launched but only one exploded. It landed in the back garden of the British Prime Minister's house. It only broke the windows at the back of the house. Prime Minister John Major had to move to Admiralty House while the windows were being fixed.

## Gallery 

File:Mortier 120mm fh000020.jpg|French 120&nbsp;mm MO-120-RT-61 mortar.
File:MSPO2007-35-01.jpg|120&nbsp;mm High Explosive mortar bomb.
File:A01-021A.png|A 120&nbsp;mm High Explosive mortar bomb.
File:MSPO2007-36-03.jpg|81&nbsp;mm high explosive mortar bomb.
File:White Phosphorous mortar round.jpg|An 81mm white phosphorus mortar shell.
File:W2 lepzmrs.jpg|Wiesel 2 lePzMrs (Lightweight Armoured Mortar of Advanced Mortar System) of the German Army.
File:Canadianmortarteam.jpg|A Canadian mortar team fighting in France, 1944.
File:American mortar crew in action near the Rhine, 1945.JPEG|American mortar crew fighting near the Rhine, 1945.
File:60mm-Mortar-Rounds.jpg|Many 60&nbsp;mm mortar bombs.
File:Finnish mortar squad.jpg|Finnish mortar squad with 81 KRH 71 Y.
File:4th Infantry Rgt. on reconnaissance mission off Highway 1 in Zabul Province 2010-10-01 1.jpg|A hand-held 60mm mortar in Afghanistan, 2010.

## Related pages
* List of heavy mortars

## References
### Notes
### More reading
* FM 3-22.90 Mortars - 7 Dec 2007(US Army)
* FM 3-22.91 Mortar Fire Direction Procedures - 17 July 2008 (US Army)

## Other websites 
* Mallet's Mortar, the biggest British mortar ever made. 
* Mortars during World War I