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Direct fire or line-of-sight fire refers to
firing Dismissal (also called firing) is the termination of employment by an employer against the will of the employee. Though such a decision can be made by an employer for a variety of reasons, ranging from an economic downturn to performance-related ...
of a
ranged weapon A ranged weapon is any weapon that can engage targets beyond hand-to-hand distance, i.e. at distances greater than the physical reach of the user holding the weapon itself. The act of using such a weapon is also known as shooting. It is someti ...
whose projectile is launched directly at a target within the line-of-sight of the user. The firing weapon must have a sighting device and an unobstructed view to the target, which means no obstacles or friendly units can be between it and the target. A weapon engaged in direct fire conversely exposes itself to direct return fire from the target.p.49, Bailey This is in contrast to
indirect fire Indirect fire is aiming and firing a projectile without relying on a direct line of sight between the gun and its target, as in the case of direct fire. Aiming is performed by calculating azimuth and inclination, and may include correcting aim ...
, which refers to firing a projectile on a curved
ballistic trajectory Projectile motion is a form of motion experienced by an object or particle (a projectile) that is projected in a gravitational field, such as from Earth's surface, and moves along a curved path under the action of gravity only. In the part ...
or delivering self-accelerated munitions capable of long range and various degrees of homing abilities to alter the
flight path In the United States, airways or air routes are defined by the Federal Aviation Administration (FAA) in two ways: "VOR Federal airways and Low/Medium Frequency (L/MF) (Colored) Federal airways" These are designated routes which aeroplanes f ...
. Indirect fire does not need a direct line-of-sight to the target because the shots are normally directed by a
forward observer An artillery observer, artillery spotter or forward observer (FO) is responsible for directing artillery and mortar fire onto a target. It may be a ''forward air controller'' (FAC) for close air support (CAS) and spotter for naval gunfire sup ...
. As such, indirect-fire weapons can shoot over obstacles or friendly units and the weapons can be concealed from
counter-battery fire Counter-battery fire (sometimes called counter-fire) is a battlefield tactic employed to defeat the enemy's indirect fire elements (multiple rocket launchers, artillery and mortars), including their target acquisition, as well as their command ...
.


Description

Examples of direct-fire weapons include most ancient and modern weapons such as bows,
crossbow A crossbow is a ranged weapon using an elastic launching device consisting of a bow-like assembly called a ''prod'', mounted horizontally on a main frame called a ''tiller'', which is hand-held in a similar fashion to the stock of a long fi ...
s,
handgun A handgun is a short- barrelled gun, typically a firearm, that is designed to be usable with only one hand. It is distinguished from a long gun (i.e. rifle, shotgun or machine gun, etc.), which needs to be held by both hands and also braced ...
s,
rifle A rifle is a long-barreled firearm designed for accurate shooting, with a barrel that has a helical pattern of grooves ( rifling) cut into the bore wall. In keeping with their focus on accuracy, rifles are typically designed to be held with ...
s,
machine gun A machine gun is a fully automatic, rifled autoloading firearm designed for sustained direct fire with rifle cartridges. Other automatic firearms such as automatic shotguns and automatic rifles (including assault rifles and battle rifles) a ...
s, and recoilless rifles. The term is most often used in the context of
artillery Artillery is a class of heavy military ranged weapons that launch munitions far beyond the range and power of infantry firearms. Early artillery development focused on the ability to breach defensive walls and fortifications during siege ...
, such as
howitzer A howitzer () is a long- ranged weapon, falling between a cannon (also known as an artillery gun in the United States), which fires shells at flat trajectories, and a mortar, which fires at high angles of ascent and descent. Howitzers, like ot ...
s and
mortars Mortar may refer to: * Mortar (weapon), an indirect-fire infantry weapon * Mortar (masonry), a material used to fill the gaps between blocks and bind them together * Mortar and pestle, a tool pair used to crush or grind * Mortar, Bihar, a villag ...
. Direct fire remained the dominant method of operating artillery throughout most of human history, with indirect fire used for
siege A siege is a military blockade of a city, or fortress, with the intent of conquering by attrition warfare, attrition, or a well-prepared assault. This derives from la, sedere, lit=to sit. Siege warfare is a form of constant, low-intensity con ...
s and involving specific
siege gun Siege artillery (also siege guns or siege cannons) are heavy guns designed to bombard fortifications, cities, and other fixed targets. They are distinct from field artillery and are a class of siege weapon capable of firing heavy cannonballs o ...
s. Technological developments born of the
Industrial Revolution The Industrial Revolution was the transition to new manufacturing processes in Great Britain, continental Europe, and the United States, that occurred during the period from around 1760 to about 1820–1840. This transition included going f ...
and the development of technical practices in the late 19th century led to an appreciation of indirect fire, although it was not until
World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
that indirect fire supplanted direct fire as the primary method by which artillery supported the other
combat arms Combat arms (or fighting arms in non-American parlance) are troops within national armed forces who participate in direct tactical ground combat. In general, they are units that carry or employ weapons, such as infantry, cavalry, and artillery ...
. During
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
direct fire remained secondary to indirect fire, although it was used profusely in situations where indirect fire was less effective, and new direct-fire artillery such as anti-tank guns and
anti-aircraft gun Anti-aircraft warfare, counter-air or air defence forces is the battlespace response to aerial warfare, defined by NATO as "all measures designed to nullify or reduce the effectiveness of hostile air action".AAP-6 It includes surface based, ...
s were developed. After World War II new technology continued to diminish the role of direct fire; however, in several situations it remains a necessary function on the modern battlefield. One of these is the defense of fixed fortified areas – for example
fire support base A fire support base (FSB, firebase or FB) is a temporary military encampment to provide artillery fire support to infantry operating in areas beyond the normal range of fire support from their own base camps. FSBs follow a number of plans, their ...
s – for which specific firing techniques and munitions such as Killer Junior and
Beehive anti-personnel round Beehive was a Vietnam war era anti-personnel round packed with metal flechettes fired from an artillery gun most popularly deployed during that conflict. It is also known as flechette rounds or their official designation, antipersonnel-tracer ( ...
s were developed. Another is when artillery is forced to defend itself, such as in a surprise attack. This could be the result of rapid maneuvering by ground forces, an attack by
airborne troops Airborne forces, airborne troops, or airborne infantry are ground combat units carried by aircraft and airdropped into battle zones, typically by parachute drop or air assault. Parachute-qualified infantry and support personnel serving in a ...
, or from the lack of defined
front lines ''Front Lines'' is a 1994 computer wargame for MS-DOS developed and published by Impressions Games. Gameplay ''Front Lines'' is a wargame with a turn-based play system, using vehicles. Reception In ''PC Gamer US'', William R. Trotter calle ...
as found in counterinsurgency operations. Direct-fire artillery can also be massed to counter a penetration by enemy
tank A tank is an armoured fighting vehicle intended as a primary offensive weapon in front-line ground combat. Tank designs are a balance of heavy firepower, strong armour, and good battlefield mobility provided by tracks and a powerful engin ...
s. In particular
self-propelled artillery Self-propelled artillery (also called locomotive artillery) is artillery equipped with its own propulsion system to move toward its firing position. Within the terminology are the self-propelled gun, self-propelled howitzer, self-propelled ...
are ideally suited for this role on account of their mobility, armor protection, and faster rate of fire compared to other weapons. A final situation is in
urban warfare Urban warfare is combat conducted in urban areas such as towns and cities. Urban combat differs from combat in the open at both the operational and the tactical levels. Complicating factors in urban warfare include the presence of civilians a ...
, where locating the enemy can be difficult, the physical structures give the defenders better protection, and the risk of
collateral damage Collateral damage is any death, injury, or other damage inflicted that is an incidental result of an activity. Originally coined by military operations, it is now also used in non-military contexts. Since the development of precision guided ...
is high. In these cases direct-fire artillery can unleash tremendous firepower to precisely destroy enemy fortified positions.p.83, Bailey For example, during the
Battle of Marawi The siege of Marawi ( fil, Pagkubkob sa Marawi), also known as the Marawi crisis (), and the Battle of Marawi (), was a five-month-long armed conflict in Marawi, Philippines, that started on May 23, 2017, between Philippine government security ...
, the
Armed Forces of the Philippines The Armed Forces of the Philippines (AFP) ( fil, Sandatahang Lakas ng Pilipinas) are the military forces of the Philippines. It consists of three main service branches; the Army, the Air Force, and the Navy (including the Marine Corps). The ...
used 105mm
M101 howitzer The M101A1 (previously designated M2A1) howitzer is an artillery piece developed and used by the United States. It was the standard U.S. light field howitzer in World War II and saw action in both the European and Pacific theaters and during the ...
s in close-range to combat
Abu Sayyaf Abu Sayyaf (; ar, جماعة أبو سياف; ', ASG), officially known by the Islamic State as the Islamic State – East Asia Province, is a Jihadist militant and pirate group that follows the Wahhabi doctrine of Sunni Islam. It is base ...
and
Maute group The Maute group ( or ), also known as the Islamic State of Lanao, was a radical Islamist group composed of former Moro Islamic Liberation Front guerrillas and foreign fighters led by Omar Maute, the alleged founder of a ''Dawlah Islamiya'', or ...
terrorists who fortified themselves in several buildings.


See also

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References


Footnotes


Bibliography

*{{Cite book, last= Bailey, first= J B A, title= Field Artillery and Firepower, year= 2004, publisher= Naval Institute Press, location= Annapolis, MD, isbn= 978-1-59114-029-0, oclc= 51931033 Artillery operation Military terminology