In the later stages of the Second World War, the Germans lost control over the skies, and their ground forces had to endure extensive enemy air attacks that decimated German logistics. The use of self-propelled anti-aircraft guns based on half-track chassis offered some way to fight back, but these were themselves highly vulnerable, as they lacked proper armor protection. Because of this, armored anti-aircraft vehicles based on a tank chassis were desirable. Starting from 1944, the German focus was on producing such vehicles based on the Panzer IV chassis, which led to the development of the Flakpanzer IV 2 cm (0.78 in) Flak 38 Vierling, known as the Wirbelwind (Whirlwind). Its 3.7 cm (1.45 in) armed Ostwind (Eastwind) cousin sacrificed a higher rate of fire for a heavier punch.

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Sources:
Zerstörer 45:
K. Hjermstad (2000), Panzer IV Squadron/Signal Publication.
Engelmann-Scheibert, H. A. Koch, O. W. v. (1978) Renz Flak Auf Dem Gefechtsfeld Podzun-Palla-Verlag
D. Nešić, (2008), Naoružanje Drugog Svetsko Rata-Nemačka, Beograd
P. Chamberlain and H. Doyle (1978) Encyclopedia of German Tanks of World War Two – Revised Edition, Arms and Armor press.
Walter J. Spielberger (1982). Gepard: The History of German Anti-Aircraft tanks, Bernard & Graefe
Ian V.Hogg (1975). German Artillery of World War Two, Purnell Book Services Ltd.
T. L.Jentz and H. L. Doyle (1998). Panzer Tracts No.12 Flak selbstfahrlafetten and Flakpanzer
T. L.Jentz and H. L. Doyle (2010). Panzer Tracts No. 12-1 – Flakpanzerkampfwagen IV and other Flakpanzer projects development and production from 1942 to 1945.
Walter J. Spielberger (1993). Panzer IV and its Variants, Schiffer Publishing Ltd.
D. Doyle (2005) German military Vehicles, Krause Publications.
H. F. Duske, T. Greenland and F. Schulz (2005) Flakpanzer IV Wirbelwind and Ostwind, Nuts and Bolts vol.13
Ostwind II:
K. Hjermstad (2000), Panzer IV Squadron/Signal Publication.
Engelmann-Scheibert, H. A. Koch, O. W. v. (1978) Renz Flak Auf Dem Gefechtsfeld Podzun-Palla-Verlag
D. Nešić, (2008), Naoružanje Drugog Svetsko Rata-Nemačka, Beograd
P. Chamberlain and H. Doyle (1978) Encyclopedia of German Tanks of World War Two – Revised Edition, Arms and Armor press.
Walter J. Spielberger (1982). Gepard The History of German Anti-Aircraft tanks, Bernard & Graefe
Ian V.Hogg (1975). German Artillery of World War Two, Purnell Book Services Ltd.
T. L.Jentz and H. L. Doyle (1998). Panzer Tracts No.12 Flak selbstfahrlafetten and Flakpanzer
T. L.Jentz and H. L. Doyle (2010). Panzer Tracts No. 12-1 – Flakpanzerkampfwagen IV and other Flakpanzer projects development and production from 1942 to 1945.
Walter J. Spielberger (1993). Panzer IV and its Variants, Schiffer Publishing Ltd.
D. Doyle (2005). German military Vehicles, Krause Publications.

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Music by @WhiteBatAudio
An article by Marko P.
Narrated by Sosoniaru
Edited by @BattlehammerWoT
Sound edited by Sosoniaru