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An assault gun (from German: Sturmgeschütz, lit. 'storm gun', meaning "assault gun")[1][2] is a type of armored infantry support vehicle and self-propelled artillery, mounting an infantry support gun on a protected self-propelled chassis,[3] intended for providing infantry with heavy direct fire support during engagement, especially against other infantry or fortified positions, secondarily also giving some armored protection and anti-armor capability.[1]
Assault guns were pioneered by the Soviet Union and Nazi Germany during the 1930s, initially being self-propelled guns with direct fire in mind (such as the Soviet SU-5-1), with Germany introducing the first purpose-built (and purpose-named) assault gun, the Sturmgeschütz III, in 1940.[1]