GD Logo small.gif (6909 bytes) Assualt Gun - "Brummbar"

Historical Information for "Brummbar"

The Sturmpanzer IV (also known as Sturmpanzer 43 or Sd.Kfz. 166) was an armoured infantry support gun based on the Panzer IV chassis used in the Second World War. It was known by the nickname Brummbär ("grizzly bear") by Allied intelligence, a name which was not used by the Germans. German soldiers nicknamed it the "Stupa", possibly a contraction of the term Sturmpanzer

The Sturmpanzer IV was a development of the Panzer IV tank designed to provide direct infantry fire support, especially in urban areas. Earlier vehicles like the StuG III were not completely adequate for this role, and therefore it was decided in early 1942 to develop a new vehicle.

The result was the Sturmpanzer IV, which used a Panzer IV chassis, with the upper hull and turret replaced by a new, fixed casemate-style armored superstructure housing the 150 mm Sturmhaubitze (StuH) 43 L/12 gun. This gun fired both high explosive and shaped charge anti-tank rounds. Thirty eight rounds, with separate propellant cartridges, could be carried.

The original design of the Sturmpanzer IV suffered from a series of flaws, which were gradually solved during the production process. The most important flaw was the high weight and recoil of the StuH 43 gun, which overloaded the Panzer IV chassis and made the entire vehicle top-heavy. Furthermore, early vehicles suffered from transmission failures and were underpowered.

Another significant flaw was the absence of a machine gun which made it easier for enemy infantry to attack the vehicle at close range. Early vehicles carried a MP 40 sub-machine gun inside, which could be fired through firing ports in the side of the superstructure.

In October 1943 it was decided that the Sturmpanzer IV's superstructure as well as the StuH 43 gun needed to be redesigned to fix these flaws. A new and lighter version of the StuH 43 gun was produced, the StuH 43/1 L/12. This gun was used from the second production series onwards.

A new superstructure was added in mid-1944 which featured a redesigned gun collar, as well as a general reduction in height of the superstructure. This redesign also introduced a ball mount in the front superstructure for a MG34 machine gun with 600 rounds.

Production began in May 1943 and continued until March 1945. A total of 298 Sturmpanzer IV were built, in four series. At first, new Panzer IV chassis were used, but from the second production series onwards, rebuilt Panzer IV Ausf. F, Ausf. G and Ausf. H were used.

The Brummbär saw action in the Eastern Front, most notably the great tank battle of Kursk, the Western Front, and Italy


Technical Information Brummbar



28.2 tonnes (62,170 lbs)


5.93 m (19.45 ft)


2.88 m (9.44 ft)


2.52 m (8.26 ft)


5 (driver, commander, gunner , 2× loader)


100 mm (3.93 in) front


15 cm StuH43 L/12

Secondary armament

1 x MG34,


Maybach HL 120 TRM, liquid-cooled gasoline 300 PS (296 hp, 220 kW)


10.64 PS/tonne


two-wheel leaf-spring bogies

Operational range

210 km (130 mi) road


40 km/h (25 mph) road, 24 km/h (15 mph) off-road