Page "Armoured fighting vehicle" Paragraph 35

Self-propelled artillery vehicles give mobility to artillery.

Within the term are covered self-propelled guns ( or howitzers ) and rocket artillery.

They are highly mobile, 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.