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15 cm sIG 33 *auf Fahrgestell Panzerkampfwagen* II (Sf)
15 cm sIG 33 auf Fahrgestell Panzerkampfwagen II (Sf)
	Wrecked example, captured by the Israelis from Egypt in 1948
Type	Heavy assault gun
Place of origin	Nazi Germany
Service history
In service	1942–1943, 1948
Used by	Nazi Germany ; Egypt
Wars	World War II ; 1948 Arab–Israeli War
Production history
Manufacturer	Alkett
Produced	1941–1942
No. built	12
Specifications
Mass	11.2 t (11.0 long tons; 12.3 short tons)
Length	5.41 m (17.7 ft)
Width	2.6 m (8.5 ft)
Height	1.9 m (6.2 ft)
Crew	4
Armor	5–30 mm (0.20–1.18 in)
Main; armament	1 × 15 cm (5.9 in) sIG 33 heavy infantry gun
Secondary; armament	1 × 7.92 mm Maschinengewehr 34
Engine	Bussing-NAG engine
Transmission	6 forward, 1 reverse gears
Suspension	leaf-spring
Operational; range	160 km (99 mi)
Maximum speed	40 km/h (25 mph)

The 15 cm sIG 33 auf Fahrgestell Panzerkampfwagen II (Sf), sometimes referred to as the Sturmpanzer II Bison, was a German assault gun used during World War II. The dozen vehicles produced were assigned to the 90th Light Infantry Division in North Africa during the war.

Development

The 15-centimetre (5.9 in) sIG 33 gun was used as direct-fire artillery in support of assaulting infantry. To improve its mobility 38 guns were mounted on a Panzerkampfwagen I chassis in February 1940. The 15 cm sIG 33 (Sf) auf Panzerkampfwagen I Ausf B that had participated in the Invasion of France in 1940 had proven to be too heavy for its chassis as well as being enormously tall.^[1]

The same gun was mated to the Panzerkampfwagen II chassis in an attempt to drastically lower its height while using a stronger chassis. The prototype used a standard Panzer II Ausf. B chassis when it was built in February 1941, but this was too cramped for use. The chassis was lengthened by 60 centimetres (24 in), which required adding a sixth roadwheel, and widened by 32 centimetres (13 in) to better accommodate the gun while preserving its low silhouette. 15-millimetre (0.6 in) plates formed the front and sides of the open-topped fighting compartment, which was also open at the rear. Its sides were notably lower than the front, which made the crew vulnerable to small arms fire and shell fragments. Large hatches were added to the rear deck to better cool the engine.^[2] The vehicle carried 30 rounds for the gun which could traverse a total of 5° left and right and used a Rblf36 sight.^[2]

Combat use

Twelve were built in December 1941 – January 1942.^[1] They were shipped to North Africa later that year, where they formed schwere Infanteriegeschütz-Kompanien (mot.S.) ("Heavy Self-propelled Infantry Gun Companies") 707 and 708. They were used as close support mobile artillery, with the former assigned to Schützen-Regiment 155 and the latter to Schützen-Regiment 200, both part of the 90. leichte Afrika-Division.^[3] Both companies fought until the Axis surrender in Tunisia in May 1943.^[2]

References

Notes

^ ^a ^b Doyle, Friedli & Jentz, p. 8-1-5
^ ^a ^b ^c Chamberlain & Doyle, p. 37
^ Trojca & Jaugitz, p. 5

Bibliography

Chamberlain, Peter, and Hilary L. Doyle. Thomas L. Jentz (Technical Editor). Encyclopedia of German Tanks of World War Two: A Complete Illustrated Directory of German Battle Tanks, Armoured Cars, Self-propelled Guns, and Semi-tracked Vehicles, 1933–1945. London: Arms and Armour Press, 1978 (revised edition 1993) ISBN 1-85409-214-6
Doyle, Hilary Louis, Friedli, Lukas and Jentz, Thomas. Sturmpanzer: Sturminfanteriegeschütz 33, Sturmpanzer and Munitionspanzer Development and Production from 1942 to 1945. Panzer Tracts No. 8-1. Boyds, Maryland: Panzer Tracts, 2014.
Trojca, Waldemar and Jaugitz, Markus. Sturmtiger and Sturmpanzer in Combat. Katowice, Poland: Model Hobby, 2008 ISBN 978-83-60041-29-1