Shotguns are not illegal in war, but their use is regulated by international humanitarian law (IHL). This law governs the conduct of armed conflict, and aims to minimize the suffering caused to civilians and combatants alike. In this article, we will explore the legality of shotguns in war, and the rules that govern their use.

Shotguns are a type of firearm that are typically used for hunting or sporting purposes. They are characterized by a short barrel and a wide muzzle, which allows them to fire multiple pellets or “shot” in a spread pattern. The use of shotguns in war dates back to World War I, where they were used for close-quarters combat in trenches and other confined spaces.
Under IHL, the use of weapons is subject to certain rules. The primary rule is that weapons must be used in a manner that avoids or minimizes harm to civilians and combatants who are hors de combat (i.e. no longer taking part in the hostilities). This is known as the principle of distinction.
The principle of distinction is enshrined in the Geneva Conventions, which are a series of treaties that establish the rules of international humanitarian law. Specifically, the First Geneva Convention, which was signed in 1864 and updated in 1949, applies to the protection of wounded and sick military personnel on land during armed conflict.
The use of shotguns in war is governed by the principle of distinction. Shotguns may be used against combatants who are actively engaging in hostilities, provided that their use is necessary and proportional to the threat posed by the combatant. However, shotguns should not be used indiscriminately or against civilians.
Additionally, shotguns may not be used to attack civilians or civilian objects. The principle of distinction requires that attacks be directed only at military objectives, which are defined as objects that by their nature, location, purpose or use make an effective contribution to military action and whose total or partial destruction, capture or neutralization, in the circumstances ruling at the time, offers a definite military advantage.
Furthermore, the use of shotguns in war is subject to the principle of proportionality. This requires that the expected military advantage of an attack must outweigh the expected harm to civilians and civilian objects. Thus, the use of shotguns must be balanced against the harm that they could cause to civilians and civilian objects in the surrounding area.
Another rule that governs the use of shotguns in war is the prohibition on the use of weapons that are likely to cause unnecessary suffering. This rule is found in the Hague Conventions, which were signed in 1899 and 1907, and seek to regulate the conduct of hostilities.
The prohibition on the use of weapons that are likely to cause unnecessary suffering is based on the principle of humanity, which seeks to minimize the suffering caused by armed conflict. The use of shotguns, like any other weapon, must therefore not cause unnecessary harm to combatants.
The use of shotguns can be problematic if they are loaded with certain types of ammunition, such as flechette rounds or “buckshot” rounds. Flechette rounds are small darts that are designed to penetrate body armor, and can cause severe injury or death. Buckshot rounds, which consist of multiple lead pellets, can also cause serious injury or death, especially at close range.
Under IHL, the use of certain types of ammunition may be prohibited or restricted, depending on the nature of the weapon and the anticipated effects of the ammunition. This is known as the principle of precaution.
The principle of precaution requires that parties to a conflict take all feasible precautions to avoid or minimize harm to civilians and civilian objects. If the use of a particular type of ammunition is likely to cause unnecessary harm to civilians or civilian objects, then its use may be restricted or prohibited .