Field artillery in the context of "Field gun"

Artillery consists of 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 sieges, and led to heavy, fairly immobile siege engines. As technology improved, lighter, more mobile field artillery cannons were developed for battlefield use. This development continues today; modern self-propelled artillery vehicles are highly mobile weapons of great versatility generally providing the largest share of an army's total firepower.

Originally, the word "artillery" referred to any group of soldiers primarily armed with some form of manufactured weapon or armour. Since the introduction of gunpowder and cannon, "artillery" has largely meant cannon, and in contemporary usage, usually refers to shell-firing guns, howitzers, and mortars (collectively called barrel artillery, cannon artillery or gun artillery) and rocket artillery. In common speech, the word "artillery" is often used to refer to individual devices, along with their accessories and fittings, although these assemblages are more properly called "equipment". However, there is no generally recognized generic term for a gun, howitzer, mortar, and so forth: the United States uses "artillery piece", but most English-speaking armies use "gun" and "mortar". The projectiles fired are typically either "shot" (if solid) or "shell" (if not solid). Historically, variants of solid shot including canister, chain shot and grapeshot were also used. "Shell" is a widely used generic term for a projectile, which is a component of munitions.

Indirect fire is shooting a projectile without relying on a direct line of sight between the gun and its target, in contrast to the case of direct fire. Aiming of indirect fire is instead performed by predicting a parabolic ballistic trajectory via calculation of the azimuth and inclination, and may include calibrating the aim by observer feedback about the actual point of impact of the preceding shot and thus readjusting to new firing angles for subsequent shots.

Indirect fire is the principal method of long-range artillery fire support, both from land and naval platforms. Due to the projectile's longer flight time (which exposes it more to deflectional factors such as drag and crosswind), curved trajectory, and the far and often obstacled "beyond-visual-range" nature of the targets, indirect fires are inherently harder to aim accurately than direct fires, resulting in a more unpredictable external ballistics and thus a much more scattered shot grouping. This, coupled with the significant blast distance of the explosive ordnance and their shrapnels, translates to a much higher risk of collateral damages and friendly fires, especially when firing danger-close.

Jan Žižka z Trocnova a Kalicha (English: John Zizka of Trocnov and the Chalice; c. 1360 – 11 October 1424) was a Czech military leader and knight who was a contemporary and follower of Jan Hus, and a prominent Radical Hussite who led the Taborite faction during the Hussite Wars. Renowned for his exceptional military skill, Žižka is celebrated as a Czech national hero. Žižka led the Hussite forces in battles against three crusades and remained undefeated throughout his military career.

Žižka was born in the village of Trocnov, located in the Kingdom of Bohemia, into a family of lower Czech nobility. According to Piccolomini's Historia Bohemica, he maintained connections within the royal court during his youth and later held the office of Chamberlain to Queen Sofia of Bavaria. He fought in the Battle of Grunwald (15 July 1410), where he defended Radzyń against the Teutonic Order. Later, he played a prominent role in the civil wars in Bohemia. He led the Hussites during the first important clashes of the conflict in the Battle of Sudoměř (1420) and in the Battle of Vítkov Hill (1420). In the Battle of Kutná Hora (1421) he defeated the army of the Holy Roman Empire and the Hungarian Kingdom. The effectiveness of his field artillery against the royal cavalry in this battle made it a successful element of Hussite armies.

The 12-pounder long gun was an intermediary calibre piece of artillery mounted on warships of the Age of Sail. They were used as main guns on the most typical frigates of the early 18th century, on the second deck of fourth-rate ships of the line, and on the upper decks or castles of 80-gun and 120-gun ships of the line. Naval 12-pounders were similar to 12-pound Army guns in the Gribeauval system: the canon lourd de 12 Gribeauval, used as a siege weapon, and the canon de 12 Gribeauval, which was considered a heavy field artillery piece.

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 or shells that required enormous transport and logistical support to operate. They lacked mobility and thus were rarely useful in more mobile warfare situations, generally having been superseded by heavy howitzers (towed and self-propelled artillery), strategic bomber aircraft, surface-to-surface missiles, ballistic missiles, cruise missiles and multiple rocket launchers in modern warfare.