The SdKfz 166 "Sturmpanzer IV", better remembered as the "Brummbar", was an early German World War 2 (1939-1945) heavily armored and armed tracked fighting vehicle built upon the chassis of the Panzerkampfwagen IV (Panzer 4) Medium Tank series. The main gun was a 15cm (150mm) field howitzer and the vehicle's primary mission was in support of ground troops, mainly in urban areas where its armament could be used to devastating effect against structures. The Sturmpanzer IV was not a "true" tank as it lacked traversing turret - instead, its powerful howitzer armament was fitted within a fixed superstructure giving the combat vehicle the proper classification of "assault gun". Additionally, the weapon only fired High-Explosive (HE) projectiles which were generally unsuitable against armored vehicles.
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