Fire support
Overview: Fire support generally consists of fire from heavy or crew-served weaponry with high firepower, including strikes and barrages from artillery, mortars, rocket artillery, and missiles; naval gunfire support from naval artillery; airstrikes, strafes, and close air support from military aircraft; and drone strikes from unmanned combat aerial vehicles; among various other forms. Fire support is typically ordered and directed by an observer (e.g. artillery observer, forward air controller, etc.) on the front line, and provided by a weapon crew or operator in the rear, usually from a fortification, vehicle, or facility (such as a fire support base).
Fire support is used to support and supplement military units that may lack the capabilities or firepower offered by fire support. For example, an infantry unit needing heavy explosives to bombard an enemy emplacement, or a large smoke screen to cover their advance, and lacking the ability to do so themselves (e.g. insufficient effectiveness using grenades), may call for fire support from a capable nearby mortar unit.
Fire support can reduce friendly casualties whilst devastating enemy capabilities and morale. Effective use of fire support—as seen during the 2018 Battle of Khasham of the Syrian Civil War, where an outnumbered force used various forms of fire support to their advantage, avoiding serious casualties—may help swing a battle in one's favor.

History: Varying forms of fire support have existed since the advent of early cannons and rockets, which were used to bombard enemy positions and fortifications to support infantry. Warships have long provided fire support using their cannons. The use of fire support in its current form developed during World War I and World War II, when combined arms and advances in technology and tactics made fire support increasingly effective.

Definition: Fire support is defined as "assistance to infantry and armored units by artillery fire, naval gunfire, and airplane strafing and bombing."

Early cannons (1300-1599): Early versions of artillery included the Roman ballista, essentially a large, mounted version of a crossbow that fired a single arrow. The first documented use of bombards, (large mortars) in Europe as we know them today was at the siege of Algeciras in 1343. By the 1470s, casting and metal work dramatically improved, giving way to the modern cannon. In the early 15th century, cast iron balls were invented for cannons. These balls, combined with gunpowder, were commonly used during sieges. By around 1550, the French had begun categorizing their guns by caliber, leading to a more organized formation of artillery.

Renaissance and revolutionary cannons (1600-1790): Circa 1650, the French garrison gun was invented. The garrison gun was usually mounted and tied down to reduce recoil, and could be mounted in very small spaces. By the mid-18th century artillery pieces were making an appearance in North America, most notably during the French and Indian War. Artillery was later used by the Americans in their  war for independence. The Continental Army used cannons captured at Fort Ticonderoga to win the Battle of Yorktown, the last major battle of the American Revolution.

Fire support during World War I and World War II (1914-1945): During the first World War, fire support was mostly used preemptively before an infantry attack. Artillery was often used to destroy enemy forces and positions, as well as obstacles in and near trenches. During this time, we also see the introduction of chemical fire support, using chemical compounds inside of shells in addition to conventional armaments. During the second World War, there was a joint usage of fire support by field artillery, naval fire support and air support. Field artillery was mainly in the western and eastern theaters, while naval fire support was used during the pacific theater, however a large number of ships were used to give fire support on D-Day. During World War II there was a large use of aerial fire support that included major improvements in technology in all theaters and campaigns of the second world war.

Fire support in Vietnam (1955–1974): During the Vietnam War, fire support was used to flush out Viet Cong positions. Most notably, napalm was used to destroy forests and jungles, resulting in less cover for the enemy.

Fire support in recent warfare (since 1975): During Operation Desert Storm the United States used fire support, particularly onboard naval craft to bombard positions. During this operation, we also see the introduction of drones into combat, as a way to provide fire support from the air without a manned aircraft. During Operation Desert storm, Artillery was used to achieve a decisive victory by coalition forces. More recently Artillery has been used in the Russo-Ukrainian war to bombard troops and key positions. When the war first broke out, the United States sent artillery aid including shells, cannons and Patriot missile defense systems to aid Ukraine. As of 2023, Fire support by tanks and artillery have been used by the Israeli Defense Force to bombard key positions in the war against Hamas.

Gallery: 

See also: Fire support base
Fire support team

References: 
Admin. “U.S. and German Field Artillery in World War II: A Comparison.” The Army Historical Foundation, 7 Apr. 2023, armyhistory.org/u-s-and-german-field-artillery-in-world-war-ii-a-comparison/. Accessed 14 May 2024.
Alexd. “Guadalcanal: The Joint Fight: The National WWII Museum: New Orleans.” The National WWII Museum | New Orleans, The National World War II Museum, 8 Feb. 2023, www.nationalww2museum.org/war/articles/guadalcanal-joint-fight-0. Accessed 14 May 2024.
“Artillery Played ‘decisive’ Role in 1st Gulf War.” AUSA, 7 Aug. 2020, www.ausa.org/news/artillery-played-%E2%80%98decisive%E2%80%99-role-1st-gulf-war. Accessed 14 May 2024.
Blosser, Kelly. “Naval Surface Fire Support—Mission Planning and Coordination.” US Navy, 1996, Accessed 02 May 2024.
“Bombardments and Barrages: Preparing American Artillery for the Front in World War I.” American Battle Monuments Commission, 24 Oct. 2017, www.abmc.gov/news-events/news/bombardments-and-barrages-preparing-american-artillery-front-world-war-i#:~:text=New%20techniques%20they%20learned%20allowed,fire%20into%20a%20defined%20area. Accessed 14 May 2024.
Coyne, James. “Weapons - Drones (Rpvs) | The Gulf War | Frontline.” PBS, Public Broadcasting Service, 1993, www.pbs.org/wgbh/frontline/wgbh/pages/frontline/gulf/weapons/drones.html#:~:text=According%20to%20a%20May%201991,Corps%2094%3B%20the%20Army%2048. Accessed 14 May 2024.
Golonka, Adrian. “The Role of Artillery in Joint Fire Support.” Safety & Defense, Safeth & Defense, 3 Nov. 2021, sd-magazine.eu/index.php/sd/article/view/136. Accessed 14 May 2024.
Admin. “U.S. and German Field Artillery in World War II: A Comparison.” The Army Historical Foundation, 7 Apr. 2023, armyhistory.org/u-s-and-german-field-artillery-in-world-war-ii-a-comparison/. Accessed 14 May 2024.
Alexd. “Guadalcanal: The Joint Fight: The National WWII Museum: New Orleans.” The National WWII Museum | New Orleans, The National World War II Museum, 8 Feb. 2023, www.nationalww2museum.org/war/articles/guadalcanal-joint-fight-0. Accessed 14 May 2024.
“Artillery Played ‘decisive’ Role in 1st Gulf War.” AUSA, 7 Aug. 2020, www.ausa.org/news/artillery-played-%E2%80%98decisive%E2%80%99-role-1st-gulf-war. Accessed 14 May 2024.
Blosser, Kelly. “Naval Surface Fire Support—Mission Planning and Coordination.” US Navy, 1996, Accessed 02 May 2024.
“Bombardments and Barrages: Preparing American Artillery for the Front in World War I.” American Battle Monuments Commission, 24 Oct. 2017, www.abmc.gov/news-events/news/bombardments-and-barrages-preparing-american-artillery-front-world-war-i#:~:text=New%20techniques%20they%20learned%20allowed,fire%20into%20a%20defined%20area. Accessed 14 May 2024.
Coyne, James.