High Quality Content by WIKIPEDIA articles! Self-propelled artillery (also called mobile artillery or locomotive artillery) vehicles are combat vehicles armed with artillery. Within the term are covered self-propelled guns (or howitzers) and rocket artillery. They are high mobility vehicles, usually based on caterpillar track carrying either a large howitzer or other field gun or alternatively a mortar or some form of rocket or missile launcher. They are usually used for long-range indirect bombardment support on the battlefield.