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The Sturmpanzer IV also called wrongly "Brummbär" is a heavily armored assault gun with a large 150 mm that was requested by Hitler for urban combat, its predecessor vehicle was directly sent to Stalingrad.

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DISCLOSURE: I was invited by the Deutsche Panzermuseum in 2018, 2019, 2020 & 2023.
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»» SOURCES ««

Doyle, Hilary Louis; Friedli, Lukas; Jentz, Thomas L.: Panzer Tracts No.81: Sturmpanzer Sturminfanteriegeschütz 33, Sturmpanzer and Munitionspanzer development and production from 1942 to 1945. Panzer Tracts: Boyds, Maryland, USA, 2014.

Jentz, Thomas L./Doyle, H.L.: Panzer Tracts No.8: Sturmgeschuetz s. Pak to Sturmmoerser. Darlington Productions: Darlington, Maryland, USA, 2000.

Töppel, Roman: Kursk 1943: The Greatest Battle of the Second World War. Helion & Company: Warwick, UK, 2018.

Hogg, Ian V.: German Artillery of World War Two. Paperback edition, Frontline Books: London, UK, 1975.

Datenblätter für HeeresWaffen, Fahrzeuge und Gerät. Pawlas: Nürnberg, Germany, 1976.

Various stuff from the German Military Archives.

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00:00 Intro
00:18 Schwere Infanteriegeschütz 33 on Panzer I B [VISUALIZED]
00:49 15 cm sIG 33 auf Fahrgestell Panzerkampfwagen II (Sf)
01:18 Sturminfanteriegeschütz 33
02:05 War Thunder
03:26 Development
04:43 Firepower
07:32 Armor
08:26 Mobility
10:12 Variants
12:45 Operational History
15:02 Naming
17:08 Production
18:42 Summary
19:09 War Thunder