Mountain guns are artillery pieces designed for mountain warfare and other areas where wheeled transport is not possible. They are generally capable of being taken apart to make smaller loads for transport by horses, humans, mules, tractors, or trucks. As such, they are sometimes called "pack guns" or "pack howitzers". During the American Civil War these small portable guns were widely used and were called "mountain howitzers".
Infantry support guns or battalion guns are artillery weapons designed and used to increase the firepower of the infantry units they are intrinsic to, offering immediate tactical response to the needs of the unit's commanding officer. They typically have short, low-velocity barrels, and light construction carriages, allowing them to be more easily manoeuvered on the battlefield. They are generally used for direct fire, rather than the indirect fire of other types of artillery. Their role has generally been replaced by tanks using tank guns, infantry fighting vehicles using autocannons, other combat vehicles, mortars, recoilless rifles, rocket-propelled grenades, and shoulder-launched missiles.
The Canon d'Infanterie de 37 modèle 1916 TRP was a French infantry support gun, first used during World War I. TRP stands for tir rapide, Puteaux. The tactical purpose of this gun was the destruction of machine gun nests.
Airborne guns are airborne artillery pieces, designed for use by paratroopers. They are generally specific or specialised types of infantry support guns, being in the traditional sense capable of being broken down into smaller loads for transport by aircraft and soldiers, thus also suitable as mountain guns. The historical concept of the "airborne guns" is to some degree outdated, their role being filled by mortars, wire-guided missiles, and/or light anti-tank weapons. As it has been many decades since two industrialized great powers engaged directly in warfare, the concept of the "airborne gun" allowing paratroopers to maintain an airhead against an armored force is in that sense non-functional, but currently, all three of the U.S. Army's howitzers, are air-mobile.
The French 75 mm field gun is a quick-firing field artillery piece adopted in March 1898. Its official French designation was: Matériel de 75 mm Mle 1897. It was commonly known as the French 75, simply the 75 and Soixante-Quinze. The French 75 was designed as an anti-personnel weapon system for delivering large volumes of time-fused shrapnel shells on enemy troops advancing in the open. After 1915 and the onset of trench warfare, impact-detonated high-explosive shells prevailed. By 1918 the 75s became the main agents of delivery for toxic gas shells. The 75s also became widely used as truck mounted anti-aircraft artillery. They were the main armament of the Saint-Chamond tank in 1918 and the char 2c.
The Canon de 105 mle 1913 Schneider was a French artillery piece used in World War I and World War II by many European countries.
The Canon de 155 C modèle 1917 Schneider, often abbreviated as the C17S, was a French howitzer designed by Schneider. It was essentially the Canon de 155 C modèle 1915 Schneider fitted with a different breech to use bagged propellant rather than the cartridge cases used by the older howitzer. It was used by France, Russian Empire, Belgium, Romania, and the United States from 1917 during World War I and was widely exported after the war. Surviving weapons were in service with France, Poland, Greece, Italy, Belgium, the United States, and Finland during World War II. Captured weapons were used by the Germans for their 2nd-line artillery and coast defense units.
The Polish Infantry Regiment; during World War 2 comprised on average some 2,900 men and 60 officers organised around 3 rifle battalions armed with either the Karabinek wz.29 or the Wz. 98, 7.92mm bolt-action rifles. Each 19-man squad was also issued the RKM wz.28 light machine gun. Other regimental weapons included the Polish version of the French Model 1897 75-mm field gun, the Wz. 35 anti-tank rifle, the Ckm wz.30 heavy machine gun, the wz.31 81 mm mortar, and the wz.36 46mm light mortar/grenade launcher.
This is an (incomplete) list of former equipments used by the Estonian Army (Maavägi:) prior to World War 2.