Comments by "Andy Dee" (@AndyViant) on "Military History Visualized"
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SU-57, SU-122, SU-152. All the SU and ISU range were all pretty much the same concept as the StuG - using a tank chassis and a casemate gun (Yes, The Soviets were Allies). I could list a dozen variants here.
If you can't cope with the Soviets being allies, despite them, you know, winning the war against Germany for us, then here's some others.
Churchill Mk1's main gun was casemate, as was the A22D Churchill, also known as the 3 inch Gun Carrier. So the British used the same concept.
M3 Lee and M3 Grant, like the Churchill Mk1 had two guns, with the main 75mm being somewhere between a casemate and a sponson, being on the front corner of the tank. So the US had them too. Of course the had the T28 and T95 super heavy (also known as the DOOM TURTLE), but of course those are post war designs.
France used the SAu 40 and the B1 series which like the Churchill and M3 Lee had 2 guns with the main being a casemate. Postwar they had the Foch, as another example.
It was also quite common with mortar carriers​.
The only things that were unique about the StuG was Germany calling them the Stug as opposed to some other model name, but hey, it's a shortened German word so you get that. Their success with them was the other main difference. Yet the M3 Medium was a success in the Africa, and the B1 were highly effective in France when used properly.
The allies, in time, had more resources and chose to build things with turrets which gave certain advantages.
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