Self-propelled 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 mortar, and self-propelled rocket artillery. They are high mobility vehicles, usually based on continuous tracks carrying either a large field gun, howitzer, mortar, or some form of rocket/missile launcher. They are usually used for long-range indirect bombardment support on the battlefield.
British AS-90s firing in Basra, Iraq, 2008
A Panzerhaubitze 2000 of the German Army arriving in Afghanistan
A 2S19M2 Msta-S of the Russian Army
British Gun Carrier Mark I (60 pdr)
Artillery are 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 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.
US Artillerymen fire-off an artillery round with the newly fielded M777 Lightweight 155-millimeter Howitzer
French soldiers in the Franco-Prussian War 1870–71
British 64 Pounder Rifled Muzzle-Loaded (RML) Gun on a Moncrieff disappearing mount, at Scaur Hill Fort, Bermuda. This is a part of a fixed battery, meant to protect against over-land attack and to serve as coastal artillery.
7-person gun crew firing a US M777 Light Towed Howitzer, War in Afghanistan, 2009