Both StuG models were given an exclusively tank destroyer role in German formations and tactical planning in the last two years of the war, greatly augmenting the capability of the dwindling tank force available to the German army on the Eastern and Western fronts.

The first known proposal for a Sturmgeschütz on the Panzer IV chassis is in Krupp drawing number W1468 dated February 1943.

During the Führer Conference of 19 to 22 August 1943, after the Battle of Kursk, Hitler had seen reports of the StuG III outperforming the Panzer IV when used in an infantry support role and tactical defence.

Another manufacturer, Vomag built a prototype Panzerjäger IV with 7.5 cm L/48 gun and demonstrated it on 20 October 1943.

In November 1943, Alkett, the manufacturer of the StuG III, suffered damage due to an Allied bombing raid.

Hitler welcomed the suggestion of taking the StuG III superstructure and mounting it on a Panzer IV chassis.